Join Date: Sep 2007
Location: Washington State
As long as you're willing to drive several hours to pick up your yearling and then to bring it to the competition, I'm pretty sure the organization doesn't mind where you're located. There are several of these sorts of events held in Texas which I know that people from Washington and Oregon have attended with mustangs they have trained.
I gentled a BLM yearling. It wasn't for an event like this -- we adopted him for ourselves. I can tell you that it's an incredible experience. If you haven't trained a horse from scratch in the past, you'll learn more about yourself and effective horsemanship than you ever thought possible. It's amazing how the littlest steps forward can become so amazing. I was always celebrating "firsts" with my boy, from the first time he took a bit of hay from my hand to the first time he wore a blanket or let me lift his feet. While gentling my yearling I really learned how to use my body language effectively, from staying neutral as I approached him to asking him to stop, turn, or move forward with the smallest changes of position or energy.
Anyway, I definitely think that it's something worth doing if you're seriously interested!