Initially I kept my ToDo in a text file and I'd just delete things when I did them. Nice clean list of what's remaining, but after a few weeks I felt AWFUL, the list grew faster than it shrank, and it felt like I never made headway.

Now I don't delete things. I put a little + at the start of the line for anything I did, a - for anything I decided not to do, and a / for anything I did partially but needs to be revisited. I write a new list each day, carrying-forward items that I feel are worth revisiting.

And what's huge is that I can scroll down and see previous lists, years worth, and read all the stuff I did. It's enormous compared to the remaining todos, and apparently that's psychologically important.