I use my guide all the time. Couldn't sew a straight line without it! I always draw the first line, stitch on the line, then line the guide up with the line of stitches just sewn to sew the next line. I didn't trust myself the first time and did a practice on a 12 inch square of plain calico. It worked like a dream. I even managed a grid, something a dope like me would never have been able to do in the past.