I followed tweety's directions with my EasyAngle ruler and have 64 practically perfect HSTs complete! Cutting to sewing in less than 1.5 hours. I pressed them after we took my Granddaughters to see the matinee showing of SING.
I pulled out my UFO Celtic Solstice while looking for my EasyAngle ruler. I think I have three steps done... I should get'erdun now too!