Check out your local college or technical institution too.
I know there are basement finishing courses offered through our technical college taught by the instructors in the apprenticeship programs. They even select one basement and a large part of the course is actual hands on work in that basement.
I'll sign up for that one when I get ready to finish my basement.
I was building a bathroom in the basement and had to do the mudding. Went to a workshop at Home Depot, came home and did a "perfect" job..... even the person who taught the course at Home Depot, who is a neighbour, thought it was perfect. Of course, the sanding is so important. So if you pay attention, you can pick up a lot of good pointers. I also went to the tiling workshop, and then tiled the bathroom floor. Next week I am tiling the splashguard in my kitchen.