Sorry you are feeling down in the dumps....take a little break, make a fresh pot of coffee and you'll be right
I still rely heavily on my little perspex 1/4 inch seam guide....simple but effective and keeps this renegade on the straight and narrow (well...mostly). Easing as you put together will help but as "polyparrot" mentioned - after quilting and laundering....only you will know the deep, dark secrets of the "not quiet perfect" matches.