When working on your dissertation, it is easy to fall into the vortex of the daily micro-steps. Dissertation writers can get lost in the minute details, obsessing about perfecting tiny details, and thus easily lose sight of the Big Picture. I suggest that you shift to the Big Picture for yourself. For many of you, it is a finished dissertation, not a perfect dissertation.
Decide what is important and what is minor. Does that footnote warrant 2 hours of research? Can you delegate reformatting the margins to a friend or editor down the line? Try to think about the overall outcome you want to achieve. Glide over the details with more ease. Shift to the Big Picture!