If there's one thing you're not likely to hear come from the mouth of someone you just hired to complete a repair is that you could have done it yourself. Most repair people aren't in the business of letting customers know that a pro wasn't really needed. In fact, a lot of the repair jobs that a plumber performs might be possible for someone with some decent renovation skills. Chances are you'll never know if this is the case, though, until you give it a whirl yourself. Unfortunately, this isn't a very good position to be in because you could end up costing yourself more money than you would have to begin with. In the end, you can always ask your plumber if it was a repair you could have handled, but it's not likely you'll get a straight answer until you've written the check.