Step 3: Disconnect the Faucet Supply Line
Now comes the fun part: disassembly. Start by disconnecting the faucet supply lines with a wrench. Make sure you place a bucket under the connections to catch any remaining water in the supply lines.
Step 4: Remove the Old Faucet
From underneath the sink, you should be able to see all the hardware holding the faucet in place. Use a wrench to remove the nuts and then lift the faucet free. If the faucet is still stuck, it may be because of corrosion. You may need to wrestle the faucet from side to side to break it loose. This is the usually the most challenging part of the process, so don't be afraid to roll up your sleeves and put some elbow grease into it. Once you've removed the faucet, make sure to clean any leftover sealant or other gunk.
Step 7: Reconnect Supply Line
Remember when you took a picture of the supply lines before you disassembled everything? Now might be a good time to pull your phone back out for reference.
Most faucets will have hot and cold water supply lines attached, so you just need to connect them to the appropriate water supply line. You may need to use Teflon™ tape (aka plumber's tape) for this part, which is used to seal and lubricate threaded pipe joints. It's pretty simple, just take a small strip of the plumber's tape and wrap it clockwise around the threads of the water supply line. Once the tape is on, you can connect the supply lines. Start by screwing in each nut by hand, then use an adjustable wrench to tighten them.
Pro tip: make sure you don't over tighten the connections, which could cause a leak.
Step 8: Remove the Aerator and Turn on the Water
Once the supply lines are connected, you need to remove the aerator from the faucet. Depending on your model, you may need to use a small tool to unscrew the aerator. Once the aerator is removed, it's time to see if all your work paid off. Slowly turn on the water and check all the connections for leaks. Let the water run for a few minutes to clear the lines, then turn off the faucet and replace the aerator. That's it, you're done!