You were a big fan, then, seeing him about 40 times. You know more than I could tell you, but I did hear an interesting 1989 interview on NPR a few days after his passing. Doc Watson talked about his first instrument (other than the harmonica he played), when at 11 years old his father made Doc his first banjo. He talked about the difficulty in learning to play as he couldn't see his father's hands. He said he had an innate musical talent, that as he became accustomed to the instrument, he let the sound guide him. He also spoke about his experiences with early electric guitars, the awkward difficulty in playing them and how, once he picked up an accoustic, he rarely played the electric anymore.
Doc Watson talked to the NPR interviewer about the fact he would have preferred a career that kept him at home. He didn't like the travelling involved with playing music. Although, he said he would definitely play music, if he'd had his eyesight, he would have wanted to be a carpenter or electrician and spend every evening at home.