Current Guns N Roses guitarist Ron "Bumblefoot" Thal did an interview with Gibson.com with some tips of how to make it in the music business.  There's some good stuff, and some funny stuff:

On a simple set of rules for making yourself employable:

Thal: "Number one, which will be funny coming from a guitarist in GUNS N' ROSES, is don't be late! That was always my cardinal rule for everything. In order to be on time you need to be early, then wait in your car for 15 minutes and walk in two minutes before whatever time you're supposed to be there.

via BLABBERMOUTH.NET.

Check out some of his solo albums, there's some cool and weird stuff and a lot of great guitar playing.