I agree with Darrin. I've been trimming my own barefoot Mustang for years. While we do our fair share of trails I'm also a classical rider and we spend a lot of time in the arena working on suppleness, flexibility and transitions. My husband rides a Belgian and his farrier will periodically check my boys feet for balance. I like having a second pair of eyes on those hard Mustang feet but I've never had a problem.
I think if it's something you are really interested in, find a good farrier to work with and be prepared to develop some new muscles!