First Day jitters

In 12 hours I will be in the middle of corralling students, going over endless amounts of paperwork, and doing my best to show the students it's going to be a good year. There will be 185 days of instruction this year, however there is only 1 first day.  This will be my 7th "first day" of school and I can assure you, I am jittery now, on the drive in it will be worse, there will be a slight calm before the storm where I assure myself I have everything together, then I will hear the incoming rush of feet pattering down the hall and it will all go out the window. I almost wonder why I meticulously plan for the first day, since it has never gone according the script. Which come to think about it, is how most of my days are.