PDJ, you can have the best trained horse in the world at home, even out on the range but the first few times you go to a show where there are tons of people, strange horses, loud speakers going off etc, that can freak a horse out! It takes time, training and experience for a horse to get used to all those things. That's what schooling shows are for, it's for the learning experience so eventually you can have a well rounded show horse.