Another much bigger project I did awhile back was rebuilding a TT. This had suffered a large, long term leak and was basically junk. I knew it when I bought it and paid accordingly.
The point of this is I had never done this either, but how hard could it be? This was one of the most fun projects I've ever done.
I won't go into all of it, just some highlights...
It looked good on the outside...
It was rotten...
So I fixed it...
After it was done it made a cross country trip then we used it as a rental for a few years before selling it. It's still in use today as a seasonal camper.
Don't be afraid, Youtube is your friend and normally people are happy to help - just ask.