Replacing a faucet cartridge is a fairly straightforward process that can be accomplished with a few basic tools. Here are the general steps you can follow to remove and replace a faucet cartridge:
Turn off the water supply to the faucet. Look for the shut-off valve under the sink and turn it clockwise until it is fully closed.
Remove the handle of the faucet. This can usually be done by prying off the decorative cap on the handle with a flathead screwdriver, and then using a Phillips screwdriver to remove the screw that holds the handle in place.
Use pliers to remove the retaining clip that holds the cartridge in place. The retaining clip may be located on the top of the cartridge or on the side, depending on the make and model of your faucet.
Pull the old cartridge out of the faucet body. If it is stuck, you can use pliers or a cartridge removal tool to help loosen it.
Insert the new cartridge into the faucet body, making sure that it is aligned correctly.
Reinstall the retaining clip to hold the cartridge in place.
Replace the faucet handle and tighten the screw to hold it in place.
Turn the water supply back on and test the faucet to make sure it is working properly.
It's important to note that the specific steps for removing and replacing a faucet cartridge may vary depending on the make and model of your faucet. Be sure to consult the manufacturer's instructions or seek the help of a professional plumber if you are unsure about how to proceed.