Instead of thinking about finising the whole project, tackle it in small pieces. Give yourself 10-20 minutes to work on the project, then go on to something else. Or maybe plan on finishing one block per day. When I do this I find myself doing more than I planned. And even if I just do 10 minutes I congratulate myself that I got that much done. When you see that stack of blocks piling up it's incentive to keep going.