I've just been working on this with my add coach, the challenge is to be objective. I had some tasks pop up amd I wanted to take them on rather than work the thing I'd been putting off. But to work on the motivation for tasks I think about the payoffs for completion and why they are important and realized the thing I was putting off in this case (retrofitting a yucky code base with a slick mew interface, but not fixing any debt) was actually less important than the popup which had a short timeline and high visibility with a customer. So "do what you don't want to" doesn't always work, and there is no substitute for thinking it through.