My screen was cracked and the sleep and volume down buttons were no longer working.
Following the steps within the provided videos and tutorials and being very very patient allowed me to fix everything on my phone and it works and looks like new.
Be patient and be detailed. Keep track of each step and label every part you remove so you know where it goes. I used double sided tape and a piece of paper and pen to keep the tiny pieces organized and labeled. It worked great. DON'T RUSH!