I haven't got the most patience in the world, so maybe if you stuck at the training more it would become a lot quicker, but I think it would take a month to train up properly and for me that was too much time out of my PhD.
Stressed- Have you got a gel wrist rest? Have you tried a wrist support? or deep heat on your hand? Make sure you are sitting directly in front of your computer, so your hands aren't twisted round.