I played for twenty years without formal lessons then started taking formal lessons about two years ago. I came in with great fingerstyle technique, but lacked so much musical knowledge that I felt I was falling way behind my peers. I knew some basic theory, but applying it to my playing was another story.
First thing I realized after sitting down with my new instructor, was how badly his playing shamed my own. I thought I was a half-
decent bassist, but he quickly proved otherwise.
I learned more about playing in the first 6 months of instruction as I did the previous 19 years of playing. We've been just bouncing around different styles and ideas for the past year. I'll go into a lesson with a question and my instructor and I will end up going off on interesting tangents that lead to more ideas and more questions.
That said, I'm taking a break from lessons for a couple months so I can go though this massive notebook full of info, really hone what I've learned, and start to apply it. There is just so much I still need to improve on. This isn't a fault on my instructor, this was me overloading myself, not practicing on my own enough, and moving past things before I fully understood them.
Looking back, I should have came up with a solid practice/study schedule between lessons. It's probably the best advice I could give you.
Anyways...good luck and enjoy!