Yes, shut off the water to the whole house and don't mess with the individual valves. Hold each valve with a crescent wrench before removing the compression nut, just as a precaution.
Don't over-tighten the compression connections. Snug them up and inspect for leaks. Tighten as necessary.
Oh yeah, remove the strainer at the water outlet before you turn the water back on. Give the new faucet a good flush before re-installing it.



)
and they tend to leak as soon as you start moving them around.

