Here’s a story I read somewhere I forgot where reflecting at how a professional is separated from a common worker.
A printing company calls in an engineer because their press is printing out of register. The engineer duly arrives, but instead of looking at the machinery, he looks at the print output.
Mmmm says the engineer. I know just what’s wrong here. He rushes out to his van to fetch a hammer.
Taking the hammer in one hand, the engineer strikes the press hard on the side, and the next piece of paper to emerge is perfect. That’s great says the printer, How much do I owe you?
That will be £500 replies the engineer.
What? asks the printer, You’ve only been here for five minutes!
Yes I know says the engineer. It’s £5 for the hire of the hammer…
… and £495 for knowing where to hit with it.