I'm freaking out about my iPhone 4?

I'm right now updating iOS 7. But I forgotten to back up the files.
I'm freaking out because I don't know what will happen if it goes wrong.
If it goes wrong, will I be able to format it back to iOS 6? (I'm not bothered if I loose stuff)
:/

Thanks

Added (1). I'm updating it through phone. Not on iTunes. And I live in England.

Apple will not let you install anything but the newest firmware. If you are doing it over the air on your phone or through iTunes it should not have any issues.

At most you will get a communication error and have to try again. It is best to leave the iphone alone during this time.

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