So where exactly do you think we will be able to find tradesmen who are capable of building things
There’s the answer to your question. Marxism!
“Those types of people...” must be trained in a classroom setting. The Union Locals are currently the most efficient and cost effective way to teach apprentices.
You can easily check, but there is a huge difference between the electric panel in your basement or garage and the control panel of a nuclear reactor. Both require the expertise of an electrician to install correctly. The difference in skill levels between the tradesmen are at least vast.
Electricians, carpenters, pipe fitters, iron workers, plumbers. If you need one of these guys to work on your house, the phone book should locate one for you in a few minutes. If you need to build a bridge to span a gorge a hundred feet deep, you might not want to go with the lowest bidder. “Those kind of people” aren’t just hanging around waiting to fix your toilet.