Everybody - at all levels - should take advantage of a good teacher/mentor. I don't limit myself to trumpet teachers either. I take periodic jazz lessons from a piano player and work with vocalists on phrasing and overall musicality. This works well for me because learning to play musically goes far beyond "trumpet technique". It is often helpful to get advice from someone who isn't going to analyze your embouchure and gear. I'll probably be outcast for that last remark on a trumpet site!!!!! PS - I study with a trumpet teacher as well. For me, I'm just seeking the proper balance to be a good overall musician.