You have gotten some very good advice and I agree with all of it, the important areas I want to reinforce is; you have got to be in a small area, round pen or corral, stall will work but you can't do as much in the stall. You have to bond with your horse and you have to be the lead horse. As dcara said don't lose to your horse, it will be much easier to lose to your horse in a large area. Again as dcara said, watch for lowering the head, other signs things are going well for both of you is chewing and/or licking the lips. This means your horse is okay with what's happening. Treats are a bad habit if given as a reward, my horses get treats in the bucket or on the ground but I never ask them to do anything for them. Usally I walk into the stall pet them and talk for a bit and drop a couple treats in the bucket on they way out, or drop some in just walking past. Idon't give treats on a regular basis, horses are creatures of habit, try feeding and hour late.
I use the Pat Parelli methods mixed in with some Cliton Anderson, Monty Roberts, and John Lyons, but mostly Parelli (who Cliton Anderson trained with) all are pretty much the same. But here is something to try it's worked for me in the past. This is a good method if you don't have a round pen. Go out to the pasture, with something to sit on (I wouldn't recommend the ground, you want to be able to move if you have to) just sit for 1/2 hr. Don't even look at your horse, completly ignore it. When it comes up to you, and it will, don't reach out, don't acknowledge it just ignore it (always keep yourself safe), if you have to push away the head (mouth) do it slowly and gently, don't scare the horse, after the half hour or so wait until it is close to you again, slowly get up lightly touch or rub, scratch it on the wethers, give it some attention and then slowly walk away, out the gate. It may take a couple of tries depending on the horse, but horses are too curious of animals not to come up to you. This should get you in the door with bonding to your horse if you don't have a round pen. As for horses and getting hurt, any horse any day, they are not dogs.
Have fun!
Alan