Hot Water Shutoff Repair

Hey guys,
Last night upon attempting a dishwasher install, we realized that neither my faucet shutoff valve and the main water shutoff valve in the basement and functioning. The dishwasher guy said it should be an easy repair for any plumber – what are the Brownstoner thoughts? Anything in particular I need to look out for? Both valves turn, but neither seem to fully shut the flow.

Also, any local plumber rec’s? Hoping to not get ripped off on this but do want it done right. Thanks!