Working from top to bottom apply removable carpet glue with a glue gun and adhere the piece to the stair.
Tack down carpet on stairs.
To achieve the right grip you need to.
Grab a sharp utility knife and a measuring tape and get to work.
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.
Cut your tack strips into lengths which are 4 inches shorter than the width of your carpet runner allocate two strips for each step of your staircase.
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.
If the carpet padding is tacked on simply pull it up and dispose.
Measure the width of the stair and length.
Cut the carpet to fit the bottom of each stair the area where the foot will fall.
Prepare the stairs using tack strips and thin pieces of wood similar to yardsticks with tacks pointing upwardm to hold your carpet in place.