Make sure the bracket is fully seated against the backplate before you crank down the screw - thats where most people mess up and strip it. @vera_lewis might be right about calling a plumber for a leaky faucet being overkill, but a stripped bracket screw is a whole different beast once it's stuck in there. A $100 fix now beats a $400 repair later if you force it the wrong way. Ever had to drill out a stripped screw on a wall mount?
Ask him if he also calls a plumber for a leaky faucet. That kind of attitude kills the chance to learn anything. It's a weird flex to be proud of not fixing stuff.