Everyone seems to know the major strokes of professionalism, but it seems that many don't know its finer points. So let's compose a list! I'll start. NO WHINING. No matter what the circumstance, whining is unprofessional. Not a whimper, no matter what. Half the time bad circumstances are a function of poor gig research, imo. The other half - you can't see them coming so no use making more of it than is necessary. As for the gig? Suck it up buttercup. Do the best you can. If you don't like the gig - smile, and then don't do it again.