Luckily for you, Google has just released a free guidebook on the Play Store, which covers everything from how to turn the device on to fine tuning performance and optimizing battery life.
The book is 84 pages long, and packed with information about not only the Nexus 7, but new features that you will come across in Jelly Bean, too.
There are lots of screenshots and little tips throughout each chapter, so you will be able to get a feel for the new version of Android before the Nexus 7 even arrives at your front door.
If you want to download the book, you can do so now for free at the Play Store, and read it in your browser or on your Android device.
Source: Play Store