Honestly, not really. There is this bad trimmer who tried to do his feet the first time. I've seen some BAD work from this guy. Then a few saddlebred trimmers, one guy that specializes in walking horses and one QH guy that you can NEVER get ahold of. That's about it.
We had a HUGE abcess blow out of his RF frog today, and the farrier was up there so the barn owner asked him to look at it and he DUG it out :( Now he's VERY tender on the FR. No trimming for him for a while. I'm going to let his feet heel and then revisit this again in 3-4 weeks. I'm also looking at taking a barefoot trimming class before I even consider touching his feet again.