Turn off the water supply valves under the sink
Open the faucet to release any remaining water pressure
Place a bucket or towel under the sink
Disconnect the hot and cold supply lines
Remove the drain stopper linkage if it blocks access
Loosen and remove the mounting nuts or brackets securing the faucet
Cut away any old caulk or sealant around the faucet base
Lift the faucet straight up and out of the sink or countertop
Clean the mounting surface before installing a new faucet