I bit the bullet and I'm taking lessons in a bid to get to single figure handicap (currently 11.8).
Playing great at times then I have serious brain fades. Par front 9 , followed by 10 over for back 9.
First lesson was really just basics - my posture had slumped a wee bit and my hands were too strong and I was over-swinging a little.
Second lesson was putting - looking at hole while practicing (rather than at ball), blind putting (committing to stroke), two ball challenge etc
You can teach old dogs new tricks!