How to prepare a young horse for the farrier?

I work with quite a few horses on a regular basis as horses are my passion, so I'm working with a young filly who has mastered picking up her feet to have them picked out, but has managed to figure out the amount of time it takes to pick out a hoof, and once that time is up she starts to fidget. So I'm worried about when the farrier comes, I don't want the horse, or the farrier getting hurt, so does anyone have any tips or tricks that would help me work with her before her farrier visit so it can go as smoothly as possible. Thanks!