Definitely agree on snacking being very seductive - it makes you feel useful and doing stuff, but when you zoom out, it's usually very inconsequential
The mental game is very important. Definitely hard to work on the things that actually matter - they are usually difficult, new, more intricate to setup, etc. What I've found to work is to "just start on it" - starting is the hardest part. Telling yourself you'll do 15 minutes of it or something, so you will actually start. Usually, when the 15 minutes are up, I won't be stopping. The inertia goes from "not going it" to "doing it" and it's hard to change ha