If the carpet padding is tacked on simply pull it up and dispose.
Tack down carpet on stairs.
Roll up the removed carpet fasten it with a piece of duct tape to keep it from unrolling and dispose of it in a contractor bag.
Pull the carpet tight and run a row of staples along the top of the riser where it meets the tread of the stair.
To achieve the right grip you need to.
Use the knee kicker to pull the carpet tight as you place another row of staples in the corner between the riser and the tread.
Grab a sharp utility knife and a measuring tape and get to work.
Measure the width of the stair and length.
Working from top to bottom apply removable carpet glue with a glue gun and adhere the piece to the stair.
Prepare your stairs for carpet installation by installing tack strips thin pieces of wood resembling yardsticks with tacks pointing upward.
Cut the carpet to fit the bottom of each stair the area where the foot will fall.