I don't know whether to laugh or cry at this post! Yup, been there done that...over and over. And that's WITH leaving myself little notes, and pinning anything that can conceivably get flipped around. I have been known to have an entire quilt top laid out, flip two pieces face to face ready to sew, walk to the sewing machine (holding the edges together that need to be sewn) and still sew the wrong edges together. Amazing.
Good luck!
Alison