Any tutorials for newbie handlers?

There doesn't seem to be anything specific on Wikifur. If it's not there, it either doesn't exist or it may be 'buried' on fursuiter-specific sites.

That said, here's some advice from a non-suiter. I'm repeating what others have said and putting my own two cents in. There's an old joke: "How do I get to Carnegie Hall?" "Practice!" While that sounds sarcastic, it isn't intended that way.

While in suit, your vision is extremely limited, almost literally tunnel vision. Your spotter/handler/wrangler must be your eyes. He must be able to communicate with you. He can speak, but it's not the usual thing for you to speak back. You may need to come up with a series of hand (paw) signals for both directions and emergencies. If you need to get to a bathroom now, you'd better have a signal for that. If you're starting to feel faint and you need to go to the Headless Lounge immediately, you should have a signal for that as well. The more time you can spend before the con going through your signals and making sure both of you know what they are, the easier it'll be at the con. Also, this can be done while only in partial suit which will make it easier on both of you at the beginning. After you get the hang of it, you could go full suit to make sure everything still works the way you want it to.

Some obvious 'signs' (at least to me) would be stop, go, left, right, up, down (escalator use), need water, return to room. Without sarcasm, your spotter is acting as a seeing-eye dog. If you've ever seen a blind person walking with one, it's a partnership. The person knows where s/he wants to go but the dog makes sure that the person doesn't walk into the street or into people. That's the kind of partnership a suiter should have with their spotter.

(Two cents jingling...)

(Edit: Addition) If possible, take some time to have your handler wear your fursuit head. Have him walk around and try to do things. Not complex things like riding a bicycle, just walking and trying to move without falling down or running into things. The "Walking a mile in another man's shoes" routine. If he knows, from experience, how limited your vision is, that may help him better anticipate problems at the con. As a guess, your hearing will also be reduced, if only because there's a layer of fur (at least) between your ears and the outside world.

And just to add a little emphasis to what charlieg said:

To paraphrase Sherlock Holmes: "You see, but you do not observe!" This is true for almost all of us. We see obstacles and avoid or overcome them, and constantly, without ever noticing them in our path. A Fursuiter cannot do this. A good handler will be looking out for the simple and mundane obstacles - the bench, the trashcan, the transition step from one floor or space to another - things that the rest of us see and yet do not see, as we avoid them almost on autopilot, without thinking about it - and he or shee must anticipate and plan a way around or over, and guide his or her charge around that obstacle, with a word or two. The handler must look out for things that the fursuit tail can catch on, for low overhangs if the fursuit head has any extra clearance issues like horns, for whether or not the entire suit is inside the elevator before the doors close - or well clear of it, once the ride is over, for the same reason.

Besides working out a code of paw-gestures to communicate need to the handler, the handler must know the fursuiter well enough to observe when the fursuiter is in distress, or when the fursuiter may be unaware of just how far gone they are from dehydration or heat-stress. While the fursuiter should know their limits, the handler should be doubly aware of them, as well - and when the handler says, "you need a break", that should be it, no argument, decision made, and both retire to a place of respite, like the headless lounge (if possible) or an out-of-general-sight room or corridor (if necessary) or - if the handler feels the circumstancdes warrant it - setting you down right then and there, and removing your head, though with proper management and understanding, it should never come to that.

The handler should be able to do these things without the need to be conspicuous or acting as a distraction - unless you are out in public, at a non-furry venue, in which case the handler also needs to keep a sharp eye out for rambunctious children or malicious teen-agers, looking for a chance to pull a tail or otherwise humiliate the fursuiter - or worse - in which case the handler must be able to intercede or interpose himself between the fursuiter and the miscreants, and make it known that at least one person is looking out for the welfare of the 'suiter, and will take protective action.

I would like to thank you both, You've actually said what I could never friggin find in all of the internet. The first and only thing that JFGI didn't fix, you did. I will refer her to this, but we really need a "How to be a handler" tutorial somewhere online, be it on this site, or any other furry sites. Im actually legitimately surprised that this was necessarily the ONLY "How To" for handlers in black and white text.

Fursuit.org has its own wiki which you might find useful.

Coming from a fursuiter's point of view I have to say that Charlie and Vulpes have covered this pretty well. I will just add a couple of points.

Hand signals: Definitely good to have but one thing to remember is that while you are in fursuit smaller movements can be more difficult to see. While you are in fursuit you need to exaggerate you movements to make them easier to see, this will go for your hand signals too.

It was mentioned that the handler will need to watch out for rambunctious or malicious children. One other thing they will need to watch for is children coming up behind the suiter. I have seen times where a fursuiter was entertaining children in front of them and a child will come up and stand behind them. Then when the suiter tries to step back they end up stepping on or knocking over a child. Just make sure the handler lets the suiter know someone is behind them.

One other tip about practicing. Sometimes it is not possible to let the handler wear a fursuit head. The head might not fit or might not be available. One work around for this would be to buy some inexpensive swim goggles and then black out all but about a dime sized hole on the lens. This would restrict their view and give them an idea of the view the suiter has. It would also be a lot cooler while practicing too.

I don't think you are going to find much on "handlers" mainly because it's very specific depending on the type of person suiting. some suits see better then others. some people are more coordinated then others. Some people are more touchy feelly and some people really really don't like to be touched.

For me, really all i need is some one to hang with, who's got a) pockets and b) fingers and things for taking camera pics, handing out business cards, and things. I see pretty well in the suit, save for reading small text, or if there is absolutely no light (like the rave if they leave lots of chairs up). This year will be even better as I will have contacts in my suit, yay.

But yea, really, if you are worried about it, then get your friend to get in suit before hand, and have him talk about how much he can see, what guidance he will need and such like that.

also what i like to comment about vision, i repair suits, and ive had allot of different suits on my head, and my experience is following:

toon eyes (good - medium (sometimes bad) vision)
follow me eyes (medium - bad)
realistic eyes (bad - horrible wors)

also with some suits you can look though the mouth, and watch the floor under you.
Each suit has different visions ranges, and some suits you have centered vision (your eyes coveres both same area) whilst others cover each another area (like waching through a short piece of pvc with both eyes)

as a suiter, first know your suit (limitations, vision range, movement abilities).
walk with your suit in home (if you can) and do the normal things:

get a beer out of the fridge,
watch tv,
sit behing a computer,
walk around,
communicate with oter people in the house (here you can learn how to talk to somebody, it sounds realy stupid, but when you watch through the jaw talking to that person, it looks like you are looking to the roof (whitch is quite rude))

with doing this, you know what to expect, how to respond to your limited sights and movements.
you cant say well when one is doing fursuiting, his vision is always like this <instert example here>
each suit is unique when it comes to vision.

just have the rule: suiters cant see depth (how far away is...) and cant see object in front of them (door steps, chairs, bins, animals, poo, branches, sidewalks, door posts, street light, canal edge)

in the last example, its not uncommon that a suiter starts running around and litterualy runs in the canal (which it acualy could possibly kill him because suits get heavy in water and the suiter panics) in holland in a few old cities we have roads and next to it runs a canal (amsterdam canals)
suiting there is a possible risk.

if ever a suiter falls it the water, i jump in to get him, because when he is in panic he probably cant swim that well.
better to warn a suiter tripple for an possible danger, than having an incident.