I usually ask them if I could watch them work. They always say yes. Then I watch what tools they use and how they use them and ask about them. They're always happy to tell me.

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.

IME they're often more than willing to share details about how broken and bad the software systems they use daily are. This is the kind of knowledge that can make you very successful as a technologist if you know how to look for it, but you'll never find it if you can't relate to people of differing backgrounds on a human level.