Steps on how to upgrade to iOS7?

I have an iphone 4s, and would like to update to the new software
first of all i want to make sure that none of my pics/videos/contacts get deleted so i would like instructions on how to sync that with itunes or icloud? Last time i tried doing that it got deleted so i want to make sure that does NOT happen this time:/

and if somebody could guide me on the steps to download ios7 that would be great, please and thank you

also if you already have it, how are you liking it?

anything else i should know about?

Connect to iTunes on your computer and do a full back up then once that is done update it it's not to hard and ios 7 looks awesome.

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