Turn off the water supply
Disconnect the drain and faucet connections
Remove the old sink if needed
Clean and dry the underside of the countertop
Measure and mark the sink position
Apply the sink template if provided
Drill pilot holes for mounting clips or brackets
Install sink clips, rails, or support brackets
Apply a continuous bead of silicone sealant to the sink rim
Lift the sink into place under the countertop
Align the sink with the opening
Tighten the mounting clips or brackets evenly
Wipe away excess sealant
Allow the sealant to cure fully
Reconnect the drain and faucet
Turn the water supply back on
Check for leaks
Seal any remaining gaps if needed