it sounds so trite, but really, I have learned, everybody has to find their own 'wiring groove' or what works for them.
For me, I have found that having 4-5 smaller projects, and maybe one big one, and just working on whichever one, floats my boat at the time, and keep moving around on all of them, is a good way for me, to keep making progress on all of them, without the burnout.
It's funny, but my grandma suggested this about three years ago, and until I finally quit worrying about what I wasn't getting done, and tried this, I wasn't very happy.
worry and guilt is not the way to go for me, and the real upside is, i do eventually finish something, and can happyily, guilt free, jump on a new project. It gives me choices, and keeps me out of the ruts. :wink: