I square up my blocks with my 15 inch square as I go. I piece the top, do my sandwiching and quilting, then comes the part I loath!! It's time to square the whole quilt before adding the binding. I have to crawl around on the floor with all my squares and rulers, sliding the cutting mat and using my rotary cutter. I then use a tape measure, corner to corner to see if the measurements match and proceed to binding. Painful but worth it to get a nice square quilt and perfectly staight binding. I'm exhausted just thinking about it. If anyone has a better method, please share!