wow, sort of shocked by how many people think it is not up to the individual to build credibility...
growing up, we were always taught that credibility is based on punctuality, reliability, preparedness, flexibility, the ability to discern opinion from fact, the ability to know when to chime in versus when to shut up, the ability to fit in socially in a situation, but to also stand for and be yourself...then, it is on ability to play, chops, style knowledge etc...
maybe it is a generational thing, but I think that credibility is totally on me, and NOT, the other guy. The other guy is going to react to whatever I give them, and if I want to be credible...if I want to be the guy who other people say "yes...definitely hire that guy", it is 100% on me, and not everyone else.
While I do have a Music Education degree, that is only one small part of my credibility resume. I know TONS of people with degrees who the least credible people around; I know a few guys who play/lead in upper level groups that IO would not trust or work with...