Define professional... A professional is a person engaged in a profession or engaging in as a profession or means of livelihood; "the professional man or woman possesses distinctive qualifications".
Professionals come in many flavors. Doctors, lawyers, politicians, electricians, golfers, carpenters, plumbers, teachers, office workers, truck drivers, telephone installers, homemakers, and artists can all be considered professionals. There are even professional students, though I wouldn't bend it that way.
Pro's know the right way to do things, and get them done... usually anyway. The pros do make a few mistakes though now and then, and it would be wise to remember that nobody is perfect all the time.
With that in mind, I offer the following Youtube video...