How do I fix a leaky faucet myself?

First, turn off the water supply valves under the sink, then turn on the faucet to release remaining pressure. The fix depends on your faucet type. For a compression faucet, the rubber washer at the bottom of the stem is usually worn out and needs replacing. For a ball or cartridge faucet, replace the cartridge or ball assembly inside. For a ceramic disc faucet, clean or replace the ceramic disc cylinder. Buy a repair kit specific to your faucet brand at a hardware store. Take photos before disassembling so you remember how parts fit together. Reassemble everything, turn the water back on slowly, and check for leaks. The whole job typically takes under an hour.