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Heating the home button prior to removal is recommended, as the rubber around the button is extremely thin and prone to ripping.
DO NOT skip this step, or you will damage the very gentle rubber hold around the home button, and that may result in a broken home button.
Well thats where I messed up
Just to clarify, the little tab on the side of the camera does not go under the motherboard, it goes under the cables. This misunderstanding is common for those new to mobile repair. Always make sure you take notes on the small things like this!
A note about screw management: ALWAYS remove screws from left to right if you are just putting them in order of removal on a magnetic trey, it helps with re-assembly. If you can, I recommend getting a magnetic white board and writing the size of the screws on it and categorizing by that, it makes it way easier and you won't ever have to worry about putting the wrong size screw in anywhere ever again.
This is held down by adhesive, don't try to just yank it off. Peel it slowly. If you damage this cable, you are slightly screwed.
Why they didn't say this, I have no idea: HEAT UP THE BACK OF THE PHONE! This helps the adhesive give so much easier, worth the extra 2 minutes to make sure you don't tear anything.
If the back doesn't slide in properly upon reassembly, you didn't insert the motherboard properly. Remove it and try it again, DO NOT try to force it down!
Use this guide to replace a cracked or broken screen in an iPhone 6s.
Thats the first line of this iphone 5 replacement part description. Good job iFixIt