I've done most of the work on all the vehicles I've owned for the past 50 years, including brake jobs. A few months ago I took my pickup to a nationwide shop for the first brake job ever I didn't do myself. Getting too old and losing interest I guess. I had to take it back twice before they got it right. Now I'm not suggesting everyone should do their own brake jobs, but I certainly am suggesting that taking it to a shop is no guarantee that it will be done correctly.
Then again, I'm from the days when you learned how to maintain cars and such because we couldn't afford not to.
OTOH, a man has got to know his limitations and I wouldn't touch a natural gas line installation.