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.
These will grip the carpet backing and hold it in place.
Grab a sharp utility knife and a measuring tape and get to work.
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.
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.
To achieve the right grip you need to.
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.
Prepare the stairs using tack strips and thin pieces of wood similar to yardsticks with tacks pointing upwardm to hold your carpet in place.
Cut the carpet to fit the bottom of each stair the area where the foot will fall.