Call me a cheater or lazy or whatever, but when I've got the not-nesting-already-sewed-these-bad-boys-down problem, I just snip the seam without cutting through it. Then I splay them apart so one goes east, the other west, then starch again, press the dickens out of them, and call it good. I've just never gotten the whole nesting thing down so I compensate. By the time I add batting, quilting, and backing, it all works together.