I'm thinking about leaving my 5S home to update while I go out for dinner shortly and I'm wondering if there is any interaction needed on my behalf once the update process begins? Can I start the update and come home with (hopefully) the update done and the phone restarted and ready to go? Or will it require some sort of action on my part? I can't remember the process when I updated to 7.0 last year. I don't want to leave it home for one or two hours and come back to find out it didn't even start yet because it was waiting for me to ackowledge something.