Actually, lessons helped me quite a bit. Took my jumps from 2 feet to 3 feet high that day, even on my crappy boat. Only have done it once, though, its expensive.
i dont' knwo i've never taken lessons but the people i know that have took it when they were on w2w's too and said it really helped them with they're edging and height. definetly get a video up here for us if you can.