1. Be open to many types of music. Do not lock yourself into a genre. How many guys can shred on Eruption that can't sit in on a simple blues progression? Keep an open mind.
2. Always strive to practice and play with musicians that are a few steps ahead if you musically. This is how you will learn and grow as a musician.
3. Listen
4. Know your gear and its limits. Just because you can bring a plywood bass with strings an inch off the fingerboard and a Crate guitar amp to gig, doesn't mean you should. On the flip side, all of the expensive gear in the world will not make up for lack of skill.
5. Practice. If you don't use it, you lose it.
6. Always work for the better of the song. Unless you're a solo performer, rehearsal and the stage is NOT a place for you to showcase your chops unless there is a context for it.
7. See #5