Don't say it, do it. It takes dicipline and real desire to recognize and do the work involved. Mark, it sounds like you have some wrist stretches that you are currently using. These are probably fine as long as you do not over stretch, but you will have to judge that. I will recomend some relaxation exercises.
Many problems come from stress placed on joints, muscles and tendons by excess tension.
Tension in the shoulders can cause tension in the arm which can cause tension in the wrists etc. It is important to discover these tension points and then learn how to release them. Feldoncreis has done more for my juggling than any amount of practice could do. I have just started studying Thai Chi and so far have been very pleased with the results. Explore them yourself.