Buy a 1/4" presser foot with guide. It makes achieving a 1/4" seam easy. Most sewing machine brands have a 1/4" with guide available, but if your dealer doesn't have one available you can buy a generic one. I would suggest you see if you can buy on made for your machine first. Also, a 1/4" with guide presser foot makes Drunkard's Path blocks easy to make.