Cut the carpet with the utility knife at the base of the stairs where it meets the ground.
Cut wall-to-wall stair carpet, or carpet that overlaps the edges, down the center of the stairs from top to bottom to split the carpet in two pieces. Cut carpet that overlaps the edges along each edge on top of the stairs to disconnect the carpet from the edges.
Pry up an edge of the carpet with the pliers, at the base where the first cut was made. Pull the carpet free of any staples that anchor the carpet to the vertical edge of the bottom stair. Pull across the base until the entire base is free.
Pull up on the edges just beneath each lip to pull the carpet free of staples anchored beneath the lips. Wall-to-wall carpet requires that you pull from the center cut towards the outer edges.
Roll the disengaged carpet from the top stair down. Cut the carpet into manageable rolls as you roll it down the stairs.
Remove any remaining chunks of carpet and loose staples with a pliers. Pry up edge pieces left over along the stairs where the carpet overlapped the edges, using the pry bar A combination of the pry bar and pliers will pull the carpet from the staples anchored beneath the lower edges of the stairs.