I honestly have no idea. My friends horse is more of a pet than a show horse, even though she shows the horse off every chance she gets.

Right now, I have the patience to train just about anything, but my dog will be 3 in Jan and he is still in the "pup stage". I wonder if horses are like this too, and for how long. We are talking about moving again, and I think it would be awesome to get a horse for my girl. I just don't want to have to call some armed guards for help "O my horse wont listen to me, I need help" kind of deal.
I think that a horse should be able to learn by hand signals, seems fairly simple (if a baby can do it, or a monkey, why not a horse). And on the note of the tone of voice, I think that alot of people end up getting frustrated too easy and become over stern with the animal, and that is why many end up failing to train them.