1. Get the horse comfortable with the entire process. That means comfortable with me approaching, with me climbing onto his back, not only that but having his feet directed by me (a predator), with the saddle and bridle, everything.
2. Teach him to go forward, backward, turn left and right and to both engage and disengage his hindquarters upon request, so that he doesn't just buck me off, flip over, and/or run away.
3. Do all of that in such a way that builds his confidence instead of destroying it.
It's so simple!
Actually, it's a miracle that they'll let us do it at all. lol.