I’m in that same guild as well, though on a much smaller scale and largely in the jazz world. Pretty much completely self taught on the bass, and cutting my teeth in the shadow of my “holy trinity” of real life, in-person bass mentors: Rufus Reid, Lynn Seaton, and John Goldsby. For years I was playing with a group that recorded albums with John when he was in town, I learned the arrangements from those albums and went from there.
Just now getting to the point where I’m getting called to be the bass player on those albums. Of course, it helps that John lives in Germany and those recordings are being made here.