Follow the manufacturer's instructions to install the shower base. Place the end of a straight edge at the outer edge of the base and draw a vertical line all the way up the drywall with a pencil. Repeat the process on the opposite wall. These lines assist with properly aligning the shower panels.
Measure the exact location of the faucet and both handle openings on the drywall. Take measurements from the bottom of the tub and both sides multiple times until you are certain the locations are accurate.
Lay one of the vinyl shower walls on top of a piece of scrap plywood and transfer the holes for the faucet and handle openings onto it using a pencil.
Put on safety glasses and insert a 4 1/2-inch hole saw bit onto a drill. Align the edges of the bit with the pencil mark and squeeze the trigger to cut out the holes.
Turn the shower wall over so the back is facing upward. Insert a tube of construction adhesive into a caulk gun and cut off 1/4 inch from the nozzle tip using a utility knife. Only use adhesive that is labeled for use on tub surrounds.
Apply the adhesive around the entire perimeter of the wall 1 inch from the edge. Then apply additional adhesive in a zigzag pattern over the entire center area of the panel.
Peel off the protective backing from the foam tape on the back of the wall panel. This tape is pre-installed on the panels and holds them to the wall until the adhesive dries.
Lift the panel up carefully and align the holes in the panel with those in the wall. Press the panel into place using firm pressure to secure the glue to the wall.
Install the remaining wall panels in the same manner. Overlap the small raised edge between each panel by the amount indicated by the manufacturer to make them watertight.