I use the square/rectangle method like Gladys and trim each one as I make baste it to the paper hexie. I do leave more than 1/4 inch because I find it isn't enough. I've gotten pretty good at eyeballing it once I pin the paper hexie to the fabric square. My seams allowances aren't all exactly the same, but it honestly doesn't matter! I did make my own width ruler out of a leftover piece of craft material so I carry that with me if I am cutting strips rather than a ruler and rotary cutter/mat. I just cut the strips with regular sewing scissors.