My husband dropped his iPhone and cracked the screen, so after Googling, I gained the confidence to try a crack (pun intended) at replacing the screen with one found on Amazon. I received the screen and started replacing the original screen and when putting it back together, had accidentally stripped one of the screws. Luckily, iFixIt had screws when the screen from Amazon did not.
Very well thanks to the handy guides at iFixIt.
Start at iFixIt, cause you sure as !@#$ are going to finish here.