Ha Ha - you guys are so funny.
You of course have to have seen what was BEFORE to know 'the secret'. Here's what it is. When stay stitching, that breath's distance that I preach about, next to the edges of all templates - don't stay stitch along ANY outside edge along the template. That is, the outside edges of the actual quilt top. I will turn the corner on the stay stitch to indicate where the edge is, but I don't stay stitch across the full length of that particular template edge (because it is an outside edge). Remember, once stay stitching has happened, and registration marks transferred, the next step is to trim LESS than a quarter inch - slightly less, but less. That is done on all templates. HOWEVER - NOT ON THAT OUTSIDE EDGE. I usually leave that one half inch up to three-quarters of an inch. I can trim that off once the quilt is QUILTED -not prior to quilting. That enables me to square up the quilt. Also, if I trim that off in the beginning, I don't have enough edge out there to do my piped binding which is larger than 1/4 inch. Having the extra fabric allows for my wider binding and squaring, but also, by NOT stay-stiching that edge, I don't have to worry about picking out any stitches that might otherwise remain after I square the quilt - which occurs AFTER I quilt the quilt.
Hope that helps. Unless you are actually doing this project, the above paragraph may not be clear. It's only a portion of the whole lessons which are in my book and shows 803-804. So - the SECRET is not to stay stitch or trim close along the outside edge of templates on the outermost edge of the quilt top.