I have been in that boat twice. The trainer that arranged my purchase of my horse, there was no way no how that he was going to ride my horse and he never did. He was always rough with the horses and jerked on their faces. After he left the stables and I had a new trainer, the new trainer rode my green horse once a week and showed in baby green, and we were both Happy as can be! After that trainer left the stables, I have a new trainer, she doesn't ride my horse. My horse is tooooo much for her to ride. So, I have a new trainer and I do all the riding with private lessons. I wish sometimes that I had a trainer ride my horse, but in the meantime I’m becoming a much better rider and push through the problems. The other day my trainer said, "You just need to pony up and get tough and realize that you must eat some dirt". I did, it worked and we're almost ready to start showing again in Feb.