I thought I would share with you my method.
Rather than cutting (for instance) 2 7/8" squares, I cut 3" squares. I always round up to the nearest 1/2" or 1". Then I cut them in half on the diagonal and sew the pieces back together.
Cutting them in half is something I never wanted to do because I use so many wovens and the bias thing just irritated me. After taking classes from Cheri, I gave in. I will say it's so much faster and because I've cut my original squares a tad bigger, I can square them up perfectly...