Being a professional isn't an easy rank to yourself to deal with, but maintaining it is the most important of all. When you say you're a professional, you must truly accept and feel it in every angle, because that's what makes you confidence, and yes, CONFIDENCE is the best way in maintaining in being a professional for the reason of, whatever situation there is that you encounter, you can always surpass it because there is Confidence in you that truly shows your a professional.