Many people still update their iPhones with their computers.
iOS 5 was designed to be independent,and you can update directly through your WiFi.
It is simple, and this video will demonstrate how to.
For more videos on iPad/iPod updates see below links:-
iOS 6 on iPad 3 most noticeable features
How to upgrade to iOS 6 your iPhone 4 / iPhone 4S / iPod touch 4th G over the Wi Fi
How to install iOS 6 over Wi Fi your iPad 3 and use SIRI (need to have min iOS 5 already)
How to update your Apple iPad to iOS 5.1.1 over WiFi (over-the-air)
iOS 5.1 update for Apple iPod/iPad/iPhone – Improve Battery Life
How to Update your Apple iPhone 4 / iPhone 4S to iOS 5.1.1 over WiFi (over the air)