About six years ago, I started to feel twinges in my hands. My doctor diagnosed me with what amounted to "pre-carpal tunnel syndrome." I started doing research. I did not find this page, then--but there were many others. The WOS entry does a fair job of summarizing the total picture Linked from there is my personal favorite typing tutor program, Ten Thumbs Typing Tutor. Using it and "immersion practice" at work, once I was competent enough not to go mad-- had me back--and then surpassing--my original [already quite fast] QWERTY speed.
If you depend on your hands and you type a lot, give it a try.
Some caveats: be prepared to re-bind MANY keys in games, and be prepared for navigating in some IDEs and editors to be more difficult. Let's just say that both emacs and vi are a whole new adventure when you switch keyboard layouts. Ugh. I've been known to switch back briefly for editing sessions, just to stop the madness. [BTW, lest you fear that this is a one way trip, QWERTY remains accessible to me with a two-stroke key sequence. When I help people reset their passwords, as happens from time-to-time, I've developed a little flourish of the keyboard that announce the keyboard is ready for input from a Qwertian. [As a giggle, I just noted that can type "qwertian" incredibly faster in the Dvorak layout than in QWERTY].