Originally Posted by Spirithorse
First I do ground prep with the horse. When the saddle is on I flap the fenders/leathers hard against the saddle until the horse is calm and relaxed with that. It's a good thing to have your horse desensitized to for safety reasons.
Desensitizing to noise and the fenders hitting the horse is not the same as a horse moving when you attempt to mount.
Our method is to make the wrong thing hard and the right thing easy. If the horse moves when you go to mount, you make the horse move. I will say move, move, move. Small trot circles, backing them up, sidepass, in hand work. When I go to mount I will say stand. If they move, the process is repeated.
You also have to think about how you are getting on the horse. Are you dragging yourself on and plopping hard on their back? If your horse is tall, then a mounting block is a good choice until you develop the leg and abdomen muscles to allow you to 'spring and light' into the saddle.