You are so fortunate to have a maintenance man who is willing to show you how to do the basic cleaning and oiling yourself! It's been my experience that most technicians do not want to share their knowledge as it results in less income for them. He is right, though, in saying that you should know how to do the simple stuff yourself. It will save you big $$ over the years! And his price is not bad, really. Consider it a "private lesson".