Turn off the water supply
Disconnect the plumbing
Remove the old vanity if needed
Measure and mark the new vanity location
Check that the floor is level
Locate and mark wall studs
Assemble the vanity if required
Position the vanity in place
Shim the vanity until level
Secure the vanity to wall studs
Reconnect the plumbing
Install the sink and countertop if separate
Apply caulk around the edges
Turn the water supply back on
Check for leaks
Install the cabinet doors and hardware if needed