ah yes, I know this "say yes now, figure out how later" thing all too well! When I say yes somehow it feels possible, I can imagine it and then later I'm befuddled scratching my head. But yes, I always figure it out and have a giant toolchest of knowhow now as a result!!
Yes, I agree. But the problem for me is remembering how I got from point A to B so I can do it again! ;)