I couldnt do lincolns on the diving board for the longest time, its pretty wierd at first. My advice is to learn them on a tramp, really get the basic motion down. When youre feelin it go to the boards, really concentrate on staying on the cartwheel axis, and not doing the extra 180. Throwing your head towards your feet helps a lot too. Yesterday I had a great day on the boards, I learned so many tricks, and lincolns werent a problem anymore. I love goin to the pool, especially since I have so much more confidence now, and Ive watched so many vids that I can really see the trick in my mind. Good luck.
'Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music.' -Kristian Wilson, Nintendo, Inc, 1989