Turn off the water supply to the sink
Open the faucet to relieve pressure and drain remaining water
Place a bucket under the sink
Disconnect the hot and cold water supply lines
Disconnect the drain trap and any other plumbing connections
Remove the sink if it is separate from the vanity top
Cut through any caulk or sealant around the vanity and backsplash
Remove the countertop if it is attached separately
Remove drawers and doors if needed for easier access
Unscrew the vanity from the wall studs
Check for screws inside the cabinet and along the back rail
Pry the vanity gently away from the wall
Lift the vanity out of place
Remove any remaining caulk, screws, and debris
Patch and repair the wall and floor as needed