Measure the width of the stair and length.
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.
To achieve the right grip you need to.
Pull the carpet tight and run a row of staples along the top of the riser where it meets the tread of the stair.
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.
These will grip the carpet backing and hold it in place.
If the carpet padding is tacked on simply pull it up and dispose.
Cut the carpet to fit the bottom of each stair the area where the foot will fall.
Prepare your stairs for carpet installation by installing tack strips thin pieces of wood resembling yardsticks with tacks pointing upward.