Clean and vacuum the sofa. Remove all of the throw pillows from the sofa.
Place the slipcover over the sofa starting from the back and top of the piece down to the front and bottom. Tuck the slipcover into the crevasses, and stretch it out to fit over the arm rests. Use the ties if the slipcover has them.
Pin the slipcover to the back of the sofa where they cannot be seen. Place the safety pins 4 inches apart around the back of the sofa. This is the best way to secure the slipcover to the sofa.
Pin the slipcover to the bottom of the sofa. Again, space the safety pins about 4 inches apart.