[chris11]

I've also heard that it's a good idea to stop at a point where there are some very easy things that you need to do, even if you might need to introduce some errors to get to that point.

For instance if you were writing a paper, and hadn't ran spelling/grammar check for awhile leaving that as the first thing you need to do the next time you start work would be a good idea. That's an easy fix that doesn't require much thought, but gives you the immediate feedback of getting something done.