I cannot reverse with my walking foot because of the gears inside of it. Instead, you can use locking stitches. If your machine doesn't have a locking stitch setting, just set the stitch length to zero and sew several stitches in the same place. This creates a knot that holds the thread in place. When you are ready to move forward, just reset the stitch length. When you get to the end, repeat the locking stitches in the same way.