Set Aside Time to Update
Whenever you decide to install iOS 9, be it tomorrow or some other time, make sure you set aside some time for the download and installation process.
You'll want to put aside some free time so that you can give the installation and download your full attention. While we expect most problems to occur right around the release time, there's always a potential for problems and you don't want to be distracted if something does occur on your phone or tablet.
Schedule some quiet time to get this update done and that way you'll be able to handle whatever iOS 9 throws at you. You'll also be able to get familiar with the update and its features in peace.
We highly recommend installing iOS updates from home base so that you're not distracted by colleagues, classmates, or work.
If you install at home, you won't have as many distractions and you'll also have easy access to necessary login information.