Cut the stair nose to length with the saw of your choice, whether a miter saw, circular saw, table saw or other type.
Cut a piece of laminate to fit the riser and be flush with the subfloor on the top step.
Install the laminate on the riser with construction adhesive. Apply a serpentine bead of adhesive to the laminate plank and press it onto the riser. If the laminate plank has attached underlayment or fabric, remove it.
Dry-fit the stair nose on top of the step where you intend to place it. The rounded nose of the molding should sit against the riser.
Apply a bead of construction adhesive to the back of the stair nose in a serpentine pattern and press it into place.
Finish the installation with two finish nails and cover the nail holes with a touch-up kit or wood putty that matches the floor.
Attach the first piece of laminate planking to the stair nose either by tongue-and-groove or glue it down, depending on the type of laminate.