My brother recently did his whole bathroom except for the electrical (which is illegal w/o an electrician license) the other month, while working, packing to move interstate, and preparing for our whole family New Zealand holiday. I think he learnt most stuff from youtube. I also think he was an idiot. If he wanted to do it, he should have done it six months earlier. Seems like he managed most things fine, though, even if he didn’t sleep for about a month.