Focus on execution, not results
If you can consistently shoot in low 80's, you have the ability to break 80... no need to overhaul your swing, although it can't hurt to practice, especially short game...
My advice is related to the mental game.
Avoid thoughts that focus on results; ie.
- I have to par the next two holes to break 80.
- There's no way I can miss this green with an 8-iron
These kind of thoughts create tension, and that has a negative effect.
I know it's a cliche, but focus on one shot at a time, and try not to keep track of you score until the round is over.
Develop a pre-shot routine where you pick a very specific target, an intermediate target for alignment, and take dead aim. That's about all you can really control. Then pull the trigger, accept the result, and go play your next shot... The key here is to accept the result.
Also, realize that as a 10-12 hdcp, you're going to probably going to average approx. 8-9 bogeys, 5-6 pars, maybe a birdie, 1-2 doubles or worse. If you have a bad hole early, don't panic, just think of it as getting your bad hole out of the way. Over 18 holes, you'll get your pars and bogeys...
Took me long time and a lot of reading to figure this stuff out, hope it helps,
Kevin