Too add to the comment: the biggest issues I've experienced usually isn't replacing the actually piece I need to replace, but accessing the piece i need to replace and learning how to do certain things.
To change my water pump, I had to creatively figure out a way to hold a rotating piece, while also loosening a bolt on it. After taking 30ish minutes looking for ways to do so, I can now do it in like 5 minutes.
I also had to learn that lowering my engine makes the above easier which required a specific set of tools to make the job possible/faster.