Once you have finished piecing measure across the center of the quilt each way - side to side and top to bottom - then cut your borders. You will have to piece the borders unless you buy enough yardage to equal the length of the quilt. I always piece my borders. When cutting, don't pile your fabric up into too many layers. If you have 2 yards, then fold it twice so you end up with 18" of fabric (18" x 4 = 72") Make sure you are pressing down really well on your ruler when you cut. It it's a little bit off on one side make sure you use the straight side against the quilt. I find that trying to cut more layers makes it easier to get it crooked. Also, make sure you rotary blade is very sharp. Hope this helps.