My favorite way is to make the strips 1/8 to 1/4 inch larger than the HST is want (plus the seam allowance). In other words, I want 2" finished half squares. I cut my strips into 3" size (2 plus 7/8 seam plus 1/8 overage). Then cut them into 3 inch squares. I use a product called Stitching Lines to mark sewing lines, sew and cut. Set seam, press square and trim down with Bloc-Lock ruler. Perfect every time. Little more trouble but perfect for Edyta Sitar quilts some of which are all HSTs.