How do you do it? I saw one video tutorial on it, but the screen was too small. Also, other than changing the view size, are there any other major changes I would have to
You need not create separate target for each device. Instead, you can change the Devices in project summary to Universal which would be in iPhone already. This is answered in the link Updating iOS 5 App to Universal on Xcode 4.2. Thus, it will do transition for you.