All of this is wrong. You can absolutely hurt yourself and i didn't backslap at all when i got the rotation. That being said, use caution, but if you think you got it, you're gonna get it just fine. If you are confident throwing the trick on a trampoline, it really isn't much different than on snow, except you have a forward momentum rather than straight up. Seriously, have a friend who knows how to do them coach you through it and have some confidence about it, you got it.