Step 2 · Remove the Faucet Handle
Examine the faucet handle to find how it is attached. Most single-handle faucets have a small set screw, which is often hidden behind a decorative cap marked with a red/blue hot/cold symbol. Use a small, flat-head screwdriver or a utility knife to gently pry this cap off. Inside, you will see the set screw. Select the correct size Allen wrench from your set and turn the screw counter-clockwise to loosen it. It only needs to be loosened enough to allow the handle to be removed; you do not need to take the screw all the way out. Once loose, lift the handle straight up and off the faucet's valve stem.