10 Things to Do Before Installing iOS 9.2.1 Beta

Go Home

Go home before you install iOS 9.2.1.

You're going to want to put aside 15-20 minutes to get the iOS 9.2.1 beta downloaded and installed on your phone. The update isn't big but it'll still take some time to download. 

At home, you're going to be around your backups, you'll be on a secure network (we hope) and you're also going to be in a place where you can efficiently handle any problems iOS 9.2.1 beta throws at you after you install it.

Installing it at a busy location (like work or a coffee shop) could be problematic.