Did everything to Step 37.. then Step 38 (yep the step of replacing the screen) almost discouraged me due to the presence of the rubber-like ring on the replacement screen (around the back camera). Since this ring was also present on the phone body, both prevented the new screen from fitting nicely. It wasn't obvious for me at first until I forcibly removed the ring from the replacement screen. Re-screwed every piece and it works like charm!!!
A serious recommendation for anyone attempting repairs: get the toolkit from iFixit!!! Don't also forget the magnetic mat - it is a MUST!!!