If I get burned on a project, I walk away from it for a short time and do something else. I have one plane I walked away from years ago. Did that one other time and it only took me 4 evenings to finish it. I have quite a few projects going. Build an easy bird that you can put together in 3 or 4 nights and then go back to it, or watch tv, or drink a beer or go chasin women one night instead of building. Never hurts to take a night off.