Tony Vegas's advice to get truely ambi was to practice twice as long on your shit side as your good side. I've just been practicing in five minute burst on each side for 1/2hrs (i.e. my usual practice time), but that seems to work, too, after a whle at least. As with all thing patience and persistance.is key. (On a side note, and related to nothing in this thread, Tony Prince is on breakfast tv right now! He got called out for sounding all mid-atlantic! Bonus!)