I was given a "hand-me-down" iPhone with a cracked screen.
With the right parts and the step-by-step instructions ... great!
1. Read through the instructions to get a sense of what can go wrong.
2. LABEL or identify those screws, they are not interchangeable.
3. Loosen the 6 washers and screws on the sides of the frame rather than removing them. Really tricky if you don't have micro hands and a real steady hand.