I became a homeowner as a never-interested DIY with EE/CS degrees. We had an unfinished basement that we paid the builder to finish only the electrical, plumbing, and framing. I'd always heard drywall'ing was easy so I left that for me to do.
At the time I knew nothing about lighting, fixtures, eletrical work, etc. Ended up agreeing to J-boxes for basement lights rather than cans, and a few other money-saving things (for the electrician).
Before doing the drywall myself, I ended up rerunning all the basement lights, running tons of outlets, installed an electrical subpanel in my garage, new plumbing lines, etc. All inspected and approved on my own permits.
I maybe watched ~200 hours on youtube (easy to do at 2x speed) and read a lot of electrical and plumbing code. But when I was done it was "done right" and not done to "save money".
I ended up saving a ton of money on the electrical and plumbing, easily in the thousands, and only saved $700 on the drywall labor. Moral of the story, don't hang your own drywall by yourself. Pay for it if you can't get a couple friends to help.