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So before doing this I have a few questions. Is this changing the OS in anyway or just adding a feature that is already there, still on iOS 4.3? Also do I need to worry when upgrading past iOS 4.3.
 
You get it free by downloading it from the Apple developer website. You don't have to be a registered payed developer just be in the program.

So basically just go through the apple developer registration which costs nothing and it will be available to download?
 
So basically just go through the apple developer registration which costs nothing and it will be available to download?

Yes it is super easy. The only reason to actually pay for it is if you are going to submit apps you made. Go to developer.apple.com/Xcode.
 
So basically just go through the apple developer registration which costs nothing and it will be available to download?

So I'll correct myself. It turns out that Xcode 3 is free on Apple's developer website, Xcode 4 you must pay the $99 for the full membership or $5 from the Mac App Store. You may be able to do this in Xcode 3 but I don't know.
 
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