I never have that problem,,when I get a bike I am so excited,,sometimes I finish them and am riding them by the end of the day lol,,,I bought one incomplete 55 corvette.,,,the guy told me he has been working on it for a year,,but just couldnt get it done,,I was riding it the next the day lol.
Here is before and after Manta Ray,,was missing the seat, chainguard , needed pedals, crank arms and a bunch of other stuff,,,took me about 3 months to gather up all the parts and get it all together. I am really good at that lol,,I am so excited about the bikes I cant wait to finish them.