Turn off the water supply to the sink
Disconnect the faucet supply lines and drain plumbing
Remove the old vanity, countertop, and sink if needed
Check the wall and floor for damage, leaks, or uneven areas
Measure the space and confirm the new vanity fits
Mark the vanity position on the wall
Locate and mark wall studs
Assemble the vanity if required
Place the vanity in position and level it
Shim the vanity until it is level and plumb
Secure the vanity to wall studs with screws
Install the countertop if separate
Install the sink if separate
Apply caulk around the vanity top and edges if needed
Reconnect the drain assembly and P-trap
Reconnect the faucet supply lines
Turn the water supply back on
Check for leaks at all connections
Install doors, drawers, and hardware if needed
Seal gaps with caulk where necessary