How to replace my iPhone 5 screen myself?

I have an AT&T white iPhone 5 and I cracked my front glass. I want to replace it myself because its cheaper. I just don't know if I need new glass or a new digitizer too? I don't know the difference. I found a $10 kit on eBay that includes all of the tools and something that looks like front glass, is that all I need? I have someone who can fix it for me if I buy the glass. But I don't know what to buy and how much it is.

If your phone still works well, you only have to replace the glass lens. But it's not easy since the glass is fragile and it's difficult to separate it from the digitizer.

Go to I fixit they have repair tools, kits, and guides on how to fix your phone.