Install the faucet on the marble top by placing the faucet stems through the holes cut in the top. Use a wrench to tighten the bolts on the underside of the vanity top to hold the faucet parts in place.

Apply a bead of silicone caulk around the underside edge of the sink cut out. Squeeze the tube of caulk slowly to ensure an even line of adhesive. Press the rim of the sink into the silicone adhesive, lining it up with the sink cutout.

Install the sink's mounting clips to the sink and the marble top. Apply a dab of epoxy on the marble top and press each bolt stem into the epoxy directly next to the sink's rim. Spread the bolt stems out evenly around the sink.

Install the clip to the sink's rim by applying a dab of epoxy to the rim of the sink next to the bolt stems and press the clip into place. Wait ten minutes for the epoxy to harden and then attach the clips to the bolt stems with a wrench to tighten the bolt down.

Carefully lift the marble vanity top onto the vanity to check its position and fit. The top should overhang the vanity by 1/2-inch on all sides and be flush to the back wall.

Remove the top from the vanity and run a bead of silicone caulk adhesive around the rim of the vanity. Squeeze the tube of caulk slowly so that a continuous bead of caulk is applied. Lift the vanity top back into place and allow it to settle onto the adhesive. Allow 24 hours to pass before hooking up the sink drain or water for the adhesives to dry.