I agree with Mercedes. You need to work with her where she'll stand without restraints before you can expect her to stand with restraints. I spent the first couple of months with my horse just working in the stall, as she wasn't truly halter trained, and hadn't had much handling, so all I was able to do was work her in the pen without restraints. When it came time to actually tie her up, she was just fine. She fidgets some still, just cause she gets bored very easily, but it is not a nervous thing, and if I tell her to stop she does. I also talked to a trainer at a rescue place that said the same thing. Work with the horse in the arena, or stall or whatever, don't tie them up, just work with them, grooming, picking up feet ect., until they understand that they need to be still. Then when the day comes that he actually does tie them up, its nothing new, nothing big, because the horse already learned that he was supposed to stand still.