To achieve the right grip you need to.
Tack down carpet on stairs.
Working from top to bottom apply removable carpet glue with a glue gun and adhere the piece to the stair.
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.
Prepare your stairs for carpet installation by installing tack strips thin pieces of wood resembling yardsticks with tacks pointing upward.
Pull the carpet tight and run a row of staples along the top of the riser where it meets the tread of the stair.
These will grip the carpet backing and hold it in place.
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.
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.
Prepare the stairs using tack strips and thin pieces of wood similar to yardsticks with tacks pointing upwardm to hold your carpet in place.