How hard is to fix a cracked screen on an iphone 4CDMA?

My iphone 4 has a shattered screen, i wana replace it myself because it will be alot cheaper. I have repaired iphone 3gs, 3g, and ipod touches in the past so i'm not new to this. How hard is it or how complicated is it to get the job done? Also my phone is jailbroken, will there be any probability that by the time i put it back together when i started apple will make me restore it?

Well first of all you need to know how to take the covers off a 4. And then how to replace the screen. I think that you do know that.
The answer? No it won't be hard, the iphone 4 is just squared off than the 3g so shouldnt b a prob!

It is pretty straight forward. We have the parts, tools and step by step videos that will walk you through the repair. We also offer FREE tech support for our customers. Chat with us live right now for more info regarding your repair.