Theres a LOT I could tell you about how I recovered. I really could write a book to answer that question. Difficult to know where to start really, but here are a few pointers, in no particular order:
-a good understanding of whats happening in your hand helps. But do you really know whats happening? if you have a finger curling tightly into the hand, it may not be the problem finger, it may be doing that to overcompensate for its neigbour, the real culprit.
-slow down therapy was key - using a metronome to measure the FD threshold and retraining below that. See the paper published by SAKAI for the details (I think Mark Ashford links to it). I started with the most basic of movements, painfully slow, and bult complexity and speed gradually as the months progressed. Charted my progress ona big spreadsheet and could actually see the progress I was making as the months went by. Hit a brick wall and you try something different, always move forward. it was at least a year before I tried any (basic) studies.
-I did a fair bit of research and read the stories of those who had recovered and asked myself 'what are the common threads?' How can I link what David Leisner did with what others have done? How can focussing your attention on the large muscles in the small of your back/shoulder whlst gently plucking a string help? What might it have in common with reciting the alphabet backwards whilst also playing a string gently? (try it) Noice any improvoement from actually focussing on your fingers whilst you try? Why do you think that is?
-Read up on Dr Farias approach : http://www.focaldystonia.net/
(get his book and video) and also Joaquin Fabra : http://musiciandystonia.com/Musiciandystonia/Home.html
Two people who have had a lot of success helping those with FD. Not surprisingly, their philosophies have things in common. Both have before/after therapy videos on youtube, check them out.
This is good:http://thepoisedguitarist.com/articles/focal-dystonia/
This can be helpful: http://www.dystonia-bb.org/forums/mwd/index.html
I have written many long posts there which others have found useful, particularly on the psychology of it. My name on the board is guitarist.
Ever tried putting on a latex surgical glove and playing? Try it and tell me what happens.
Another interesting approach is to play just with your right hand, open strings, very slowly and using your left hand gently tap the middle knuckle of a problem finger before it plays. Thats one to play around with and it really depends on what your hand is doing, but its all about sending a little sensory input just where its needed.
That should be enough to keep you busy for a while!