Practice makes................well, not perfect, no one ever gets perfect
I too play guitar, I played for many years and didn't progress a whole lot, but it was because a relied heavily on what I knew and didn't venture out and make mistakes...crash so to speak. When I started flying I liked building, and didn't mind crashing, and I learned to do a lot of things. Now I fly more conservatively, so I have a very good base flying ability, but I don't learn the new maneuvers very easily because I don't have time to crash and rebuild any more.
Something I learned a year or two ago that I apply to my guitar playing is not that "practice makes perfect" I read somewhere a quote that I like, and I wish I rembered who said it so I could give credit. "practice makes permanent, perfect practice makes perfect."
Austin