Measure the base cabinets and confirm the countertop dimensions
Check that the cabinets are level, plumb, and securely fastened
Remove the old countertop if needed
Dry-fit the new countertop pieces
Mark sink, cooktop, faucet, and seam locations
Cut openings for the sink, cooktop, and fixtures
Apply adhesive or construction adhesive to the cabinet tops
Set the countertop in place carefully
Align seams and join countertop sections
Clamp or fasten the countertop according to the material and manufacturer instructions
Install sink, faucet, and cooktop after the countertop is secured
Seal seams, edges, and sink cutouts with silicone or approved sealant
Wipe away excess adhesive or sealant
Check for level and proper fit
Allow adhesive and sealant to cure fully before use