TIP: FIX POOR WATER PRESSURE by cleaning the faucet aerator. This is located at the end of the faucet where the water comes out.
Simply unscrew (you might need pliers with tape to prevent scratches) and clean. If yours looks particularly old and worn, hit a home center to get a new one. Can't find a replacement? Try soaking it in vinegar overnight for a deep clean. Make sure you put it back together the way you took it apart!