OK, No I don't have a mini cutting mat, just the large one. I get the idea though, it can be turned to make the next cut without disturbing the square. When I get the template I will use the gluestick to help hold it. That is a great tip! I was trying the current templates and I can see how easy they can slide, especially with my heavier brushed fabric and thicker seams. The glue should help a lot. I know the HSTs are kind of crooked, but I did rip them all out and may have distorted them in doing so. But to be honest, they were crooked before I started! As I said, this was my very first attempt at piecing and I did not know much about quilting techniques at the time. Plus, the triangles are not necessarily with their original mate, if that makes any difference. I see how much more accurate the trimming will be with the template points securely on the seam line.
I clicked on the link and will go back to it and read it carefully. Thanks for your help!