Do you know anybody that has a renovation project in their house that hasn't been completed? It just sits there half-finished, or it's being worked on one little bit at a time. I completely understand why DIY projects don't get completed. When you've done the fun part of tearing everything apart, you're then faced with reality of the amount of work ahead of you.
Looking ahead at the amount of work it will take to reach the goal can either motivate you or paralyze you.