Leitner box work well and because it need you to space your sessions it should help not getting overwhelmed by them. And since you need to chose precisely what you want to learn it make you part the subject.
If you don't want to try leitner box, defining what you want to learn should help you not trying to learn too much at once.
Keeping a done list everytime I make a to do list. It happen often to me to feel exhausted and guilty because I'm exhausted and gonna rest without having anything of what I've planned done. The done list really helps me, I also put things on it that weren't even in my td list in the first place, like eating in a bad day.