While you can probably install your own toilet, the plumber will help with more difficult projects like carving out a sparkling new bathroom, adding a shower on the kids’ floor or running lines in your new kitchen.
Talk to neighbours who have had remodeling or new construction work completed recently and get names. Keep in mind that you are hiring a plumber for remodeling or construction, not for repair. Those quickie-plumber trucks you see all over town specialize in emergency repairs. What you want is a plumber who will come prepared on an assigned date and perform solid work, follow a pre-determined estimate, and assist you in your kitchen or bathroom renovation.