I cut the tee shirt much larger than the finished block size. Then, I place a teflon applique sheet down on my ironing board and then place the tee shirt face down on the teflon sheet and put the fusable interfacing glue side down on the wrong side of the tee shirt. I use steam to help make the glue stick to the tee shirt. I do this on each one. Then I cut the tee shirts in the size I want them to be in the quilt. I have learned to be generous with the pre cut size to allow the blocks to be cut to fit the design on them. Also, dont cut the blocks until after you put the stabilizer on the back. They stretch and distort the shape too easy and you just have to cut them twice to get them right.