Study with whoever you can. If your instructor tries to tell you that you cannot train with other clubs, read certain material, or affiliate with two organizations or martial arts at once, tell him to kiss your ass. Everything is Politics - Don't think for a second that the people you piss off today will not be your worst nightmare tomorrow. Sometimes people not only burn bridges, they create their nememis. Be polite with everyone, and always consider that you might need them later on.
Every conversation is a meeting, a chance to build bridges with others, a chance to network.
Be especially nice to those punks that make you jealous of their talent. They can either be your supporters and friends or they can build gigantic web sites that say your way of doing things sucks. I just want to train. The last thing he wants to do is train. He wants to do things his way, and he's trying to cover his real intentions.