Barefoot girl, I'm not sure if you are aware of this or not... you might want to do some research to see if it is true, or at least keep it in mind when you try to trim this mule... Donkeys and mules can kick you with the same side leg as the one you are trimming with. Horses can not do that. If you are trimming the right front, they can kick you with the right back. and vise versa. I read that somewhere.. also ready they are extremely intelligent.
Good luck doing the trim.. you'll have to let us know how it goes.