Oh, believe me, I had some fears when I started riding English too! I was like, "Woa, there's nothing to hold you on except balance!" I think the biggest thing, is to get used to riding English slow at first and gradually get faster and better. But I don't think there is any real way to gurantee you are not going to fall off. It happens in western too, and there's really nothing you can do to prevent it...when you get on a horse, you have to be prepared and ready at any time to fall off. Don't get on the horse if you're too scared, or you'll scare the horse! I mean, horses spook, buck, and rear...even the tamest most gentle horses; I've experienced it! I don't want to scare you, but I don't want to lie either. And remember--you can't prevent accidents, that's why they're called accidents. Good luck!