I do all the maintenance on my car. I have learned 95% from watching other people do it on youtube. The other 5% is from forum posts and a repair manual.
You generally start with a pry-bar if you've got to take something apart first, maybe a hammer. If not, you start by cutting some wood to size!
Home renovation work is easier done than said IMO
The part that got me was "replaced the plumbing".
Youtube, for me. It's not perfect, but it is often good enough.