OK, I'll be the doom-and-gloom guy. If you miss a connection and it blows during the night or while you're away, will your home owner's insurance cover the damages for DIY work? If not, a bonded pro might be worth it.
No offense intended to jmwking, but the cure for FUD like that is rather simple: get a plumbing permit, and have the work inspected as required
Cheers
Hope the plumbing inspector is better than the home inspector
Big difference there.
The city Plumbing Inspector is a pro who signs off on the work, and that should be more than sufficient for any insurance FUD.
Home Inspectors are just a racket, like lot surveyors -- those both fall into the category of unnecessary things that many buyers often shell out for (not knowing any better).
Sure, once or twice one of them might find something significant enough to make their fees not a total loss, but..
Cheers