I thought the main piece of advice on that front was "Trust that slow progress is better than no progress". (It's even a section heading.) That terse bit isn't

I thought the main piece of advice on that front was "Trust that slow progress is better than no progress". (It's even a section heading.) That terse bit isn't unpacked very explicitly, but it shows up in the roundabout path the author took: coding bootcamp, contract work, finding a product idea. As is pointed out in comments below, setting a lower goal barrier can help you get rolling. "Some progress is better than no progress" is, I think, the ultimate version of that.