On my own. When I was a kid I started with my sis's piano books and she taught me how to read it. I had to figure out the notes on the guitar. Back in the 60 there wasn't much material for guitars. It was slow going and I dropped it many times.
In high school my friends wanted to start a band so I picked up the guitar again and started learning again. We played Surf Instros like Pipeline, Walk Don't Run, Raunchy etc.
We named ourselves The Brazen Men. It was fun.