I use a walking foot, of course, but I use a guide attachment that came with my Pfaff. You can adjust it for any width. I start in the center, usually drawing a line diagonally with chalk, then use the guide for the next row. I work from the middle out, then rotate and go from the middle out on the other side. It goes fast and can make a pretty straight line. When I finish going in one direction, I start over again in the opposite direction.