If you actually did talk to your plumber, or electrician, or mechanic, or anyone else you view as "lower" than you, you might have actually learned something. Interesting paradox, that.
For example, I watched the cable guy install coax. I then bought the same tools he used, and later wired up the coax myself in the next house. I also watched tradesmen cut & sweat pipes, service my furnace, install molding, etc. All very interesting and useful.