Joaquin Fabra is a trombonist/euphoniumist who was stuck with focal dystonia many years ago, and managed to rehabilitate himself completely. Fabra believes that focal dystonia is a behavioural disorder and not a neurological one, and should be treated as such. For the last twenty years he has been treating other musicians, without the use of medication or splints.
His methods have been seen as controversial by some within the medical community, and the focus of many arguments in FD forums.
His YouTube channel has lots of before/after type videos, and is worth a look, even just to see the variety of symptoms on display.