Just pay attention.
Never complain about doing an order from your key. Just do it. As mentioned above, the quiet guys that work hard always get called back. If you are unsure about doing something, ask someones opinion that you trust before you make a mistake that could cost the crew a lot of time. Do not blurt out to the entire crew your question, they will question your experience. If you are a young gun, act responsible. If they ask you how old you are, tell them your either too old or too young and that is bad for business. Righty tighty lefty loosey. Safety chains.