One suggestion, UPDATE YOUR MAILING ADDRESS NOW. I can't tell you how many threads I've read over the years when the new iPhone gets released, everyone is at work and it's being mailed to their home or it's they'll be out of town and it's being mailed to where no one will be.
Remember, a signature is required and I would suggest you get it mailed somewhere you will be available (no potty breaks when you see "out for delivery") or mail it somewhere so it can be signed for.
It would actually be good practice to update everything on your profile with apple.com or wherever you plan on ordering the new iPhone when it becomes available.
I've since updated all address (apple.com, credit card and carrier) to show my work address to ensure I would have no hiccups. I would also suggest if you're changing your address for this alone, do it a few days before pre-order is available (I did it now).
I don't want any casualties on my watch.
carry on.