when i have tried lincolns on jumps with big kicks, i usually end up poppin backwards. this makes a flatspin (which is cool) but is not a lincoln. Be sure to look forward the whole time. As one guy i know says, "practice cartwheels, viualize stomping it"
For ur first try, try it on a jump with a low kick, but a big jump (if u know what i mean). its really an east trick, just takes balls.