I had a horse accident and broke both of my arms, had surgery, and was in PT for 14 mts. It was hard to get back on.
I started with a dead broke horse that I knew I could trust, rode him a few times before getting on my frisky guy.
I had to talk to myself alot, and say it was going to be OK, it was that horse, not all are alike. Now about 5 yrs later, I don't even think about the accident anymore.
But I do have a rule, never ride a horse before seeing someone else ride it first.
Hope this helps.