It ain't about soldering plumbing pipe. It's about "hard soldering" a variety of metals, both precious and regular, preventing fire scale, proper fluxes to use, fixturing complex designs, etc. It's the type of work that Rolf, Jerry, Acer, Dave, et al would do to make complex sideplates, trigger guards, etc.
If you think education is expensive, consider the price of ignorance. It's there for them that's interested. Them that ain't can blow their bucks on a couple of 12 paks of beer.