I do as much as possible, sometimes taking on something beyond my current capabilities, but that's how you learn, right? I also have the backup of my Dad and FIL, who are both very handy.
In the past 5 years, I can only recall one shop visit, and that was after assistance from my FIL (who has the ability to builds custom cars and access to every tool imaginable) couldn't replace a part due to specialized equipment required by the manufacturer.