I use GTD - basically break it up into sub projects, create a mind map of what each part will do, then forget about it all, clear your head so you can think pro

I use GTD - basically break it up into sub projects, create a mind map of what each part will do, then forget about it all, clear your head so you can think properly and not get stressed. You then browse these pages occasionally and pick out some tasks to put into your next actions list. Keep at it, and eventually it'll be done, no stress, no overwhelming lists of stuff to do. Works great :) Id suggest buying the gtd book if you're interested.