Well, I've told this often, but it is a thread topic again so here goes.
I played classical piano up until I was 15 years old. I was pretty advanced for my age, but got to the point I didn't want to play piano any more. I wanted to play guitar, and rock and roll guitar. When I got my first guitar, I had no books, no teacher, no lessons, no NOTHING. Except a good ear. I'd sit down and turn an album on and play along with it and learn the songs. There were no "online instructional videos" or anything like that, because there was no "online." You either took lessons at a music store, or you winged it. Thank God I had a good enough ear, and enough musical background, that I could learn it all without any help.
Now, I've said a million times. I'm no chordsmith or anything. I don't know 50 inversions of every chord. But, when I'd hear a different version of a chord, I could usually figure it out quickly and move on, even if I didn't "know" what chord I was actually playing. To this day, I learn most things by ear and only consult a basic chord chart for some things when I play at church, and only sometimes. I've never bought tab charts, instructional videos, etc. I've pretty much taught myself everything I know. YES, by watching, copying, duplicating etc., but I've never had any type of actual instruction.
Now, if you think I suck at guitar, that doesn't really mean much... except that I probably should have taken lessons!