If you can spare the time, watch the documentary here:
From glam rock superstars, to singer-songwriters, to fusion players and metalheads, these player not only talk about their personal histories with the guitar, but also share valuable advice. As it's just under 2 1/2 hours in length, and mostly interviews, you'll have to commit – but it's really worth it. Many of their personal insights are shared, and I enjoyed how the documentary was put together.