One thing I've found helpful is to start a game journal. Get a notebook. After every game, or set of games, spend a few minutes reviewing the game. In mine I try to note:
- Things that went particularly well
- Things that didn't go well
- Unusual things that happened, including looking up rules, etc. and noting them
- Things I'm working on that game, and how they went
- I keep a running list of things to work on
The game journal has a lot of positives to it: self-accountability, the opportunity to reflect on plays and situations and think about how to handle them next time, a valuable memory jog (if you briefly review your most recent notes before your next game). And perhaps most valuable of all, I find that if I can "bleed" all the ugliness out onto paper, I don't spend nearly so much time reliving all the horrors that night.