An iPhone is like a piece of toast. It always lands face down
I bumped my phone with my elbow. It fell off the counter and landed face first, smashing the screen.
The first screen I ordered was smashed during shipping.
However, after informing iFixit, I had another new one in my hands two days later. The best part was that despite iFixit was shipping it to Canada, they managed to ship me two new displays(the original and the replacement)within one week.
Just in time for me to go on holidays with an iPhone that was as good as new.
Once you get your replacement parts, take your time, follow the online directions, and if you have them...wear some dust free latex gloves (helps with not having to clean small electronics when you get finger oils on them).