Hi Surly,
I just build and build again the model Im currently trying to build has been taken apart at least six times! this afternoon I gave up again! - think this truck will need to wait until my inspiration comes back.
I find having a few projects at the same time can help. I normally start one and put it to one side when I get stuck then I come back to it later, sometimes years later. I currently have 3 models on the go and I might start a forth later
I always take pictures of my failed projects to help me in case I want to restart them - this speeds up the process of the next one.