I have this problem, too. I used to tell myself that I couldn't work on anything else until I finished the project already started but all that did was make it more difficult. I couldn't start a new project because the old one wasn't finished and the old one wasn't finished because I didn't want to work on it ..... and so on and so on. Should have just broke my own rule and worked on what I wanted to do when I wanted to do it because nothing is getting finished this way! I like the 20-minute technique. Think I'll try that and see if that works for me. :-)