The toughest part of replacing a kitchen faucet is removing the old one. Unexpected problems always pop upâcorroded pipes, difficult-to-reach nuts and poor access to fittings. Otherwise, installing a new kitchen faucet isnât tough at all. Actually, the directions that come with your new faucet are probably all youâll need to do that part of the job. Barring unforeseen problems, you could be washing up under the faucet in an hour or so.