Good luck! It's nerve wracking, isn't it? I am considering shows for one of mine at the moment.
About sewing the miter closed, Sharon Schamber has a tutorial on binding and she shows sewing it closed. I guess I'll do that as it only takes a minute to do.
The part of sewing it closed is at the very end done by hand.
http://sharonschambernetwork.com/fre...gel/index.html