I've found that un-learning stuff isn't really necessary, and that in fact some of the previous training helps rather than harms, as it conditions your mind and makes easier for you to grow accustomed to the patterns of combat, old or new. True, you do need to modify your instincts just a bit, especially in the case of hard-headed traditionalist teachers (fewer than one would suspect, I've found) who object to inadvertent slips into previous techniques. But I've never felt it necessary to unlearn anything when switching arts.

Aikido is a blast, though unfortunately my experience with it amounts to only a couple 6 hr. long seminars almost 10 years ago. My sister's husband has been taking it in tandem with tae kwan do for about 5 years now, and he routinely uses it to put the hurt on me. The bastard.

Have fun with that, man. [grin]

I took aikido for a couple of years. It was great.