I did the half sq. triangle the way the Missouri Quilt Co. showed in the tutorial....sewing the sqs together all the way around....cut down the middle and the middle again......and did not have one problem with them. I do think that pressing is the key word here. I never used one pin...pressed as i went and every block came out perfect...no trimming. I made it of vintage sheets and white...all sheets and am ready to make a million more...so refreshing. I swore I would NEVER do those piece and stitch them back together but this was a breeze for me. j