I learned it in a few days of work. You could too. I don't recommend YouTube though!
The most complicated thing is knowing the code, which boils down to just a handful of simple rules for residential stuff. Most importantly: look it up, don't guess. There's a right way to do everything, and it's never the hard way. There is very little variance or judgement call involved, the code is quite clear and specific.
Doing it right might take additional materials or time though, and that's fine.
Just want to say the push back you're getting on this topic is one I've experienced everywhere - the actual work of the trades is basically treated as an unknowable black magic which only it's arcane practitioners can do.
Which I think is partly held up essentially by the "dodgy tradie" stories which are routinely passed around but get re-interpreted as "it's very easy to do <obvious stupid thing>" when the stupid thing is something like "don't do a wire run from 10 short pieces of wire you have lying around" or "PVC pipes need to be glued together to not leak".
I built my entire house shell from 3 hours of larry haun on youtube in russian and almost nothing else with no experience. Just watched I then copied everything. The hardest part was getting a hold of a 6 ton backhoe for a day to dig the footings, which I also learned to use by pure experimentation about 15 minutes before I dug my foundation.
The most complicated thing is knowing the code, which boils down to just a handful of simple rules for residential stuff. Most importantly: look it up, don't guess. There's a right way to do everything, and it's never the hard way. There is very little variance or judgement call involved, the code is quite clear and specific.
Doing it right might take additional materials or time though, and that's fine.