Sewing the piping is not all that difficult.

How to  Sew Piping

1. Before you start, you need the following items:
2. Your cushion fabric, cut and pressed but not yet sewn
3. Cloth measuring tape
4. A few yards of cord-filled piping for each sofa cushion
   
   To figure out how much piping you need per cushion, just measure the length of each seam in which you intend to insert the piping and add a few inches for turning corners. For one 24 x 24-inch cushion from an average-size, 87-inch-wide sofa, you need 5 to 6 yards of piping.
   Iron and ironing board
   
   Scissors Sewing machine with appropriate color heavy-duty thread Straight pins
   Follow these simple steps to have beautiful piping in no time:
   Iron all your fabric well so your piping and cushion fabric attach smoothly.
   Working on the right side of the fabric, chalk your 1/2-inch seam allowance line all the way around the edge of the fabric where you’ll be applying the piping. Marking fabric with chalk
5. Start on the back of the cushion, so you end your piping in an area out of sight (your cushion looks more streamlined).
   Line up your piping on the right side of the fabric so that the piping’s seam allowance is aligned on the cushion fabric’s seam allowance.
   Lining up the piping on the right side of a pillow slipcover.
   The piping’s raw edges need to be oriented toward the raw edge of the cushion fabric. The tube part of the piping needs to be just over the 1/2-inch chalked line.
   Pin or machine baste the piping and fabric together to keep them in place.
   If you prefer to hand baste the fabric together, you can do that instead.
   Place the corresponding layer of fabric over the top of the pinned or basted layer.
   Using your zipper foot, sew at the 1/2-inch seam allowance, getting as close to the piping as you can.