These shut-off valves don't last long before they lock up. There is always the chance that they'll break. Go ahead and turn off the main water valve, then remove the packing nut (Google images for valve packing nut). This should allow you to turn the valve stem. However, you still run the risk of not being able to get to shut off. I almost always have to replace these shut-off valves whenever replacing a faucet anyway. So, assuming the valves are threaded on to the supply pipe (not soldered) then buy replacement valves as a very first step. I am assuming you won't want to do the soldered fitting yourself. Good luck,
Testimonial: "Thank you. I'll give it a try, and cross my fingers."
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