1 - 2 uren
Cracked my screen in a couple of different places. Got tired of looking through said cracks, and I didn't feel like paying someone else to do it. And I knew that I was technologically capable of fixing it.
The process was relatively smooth. I got some latex gloves from my work and was ready to dig into the guts of my 4S. Fast forward 25 minutes. I was at the flat-head motherboard screws. You know that cool little flat-head screwdriver they give you? Yeah, mine DID NOT work. I ended up having to sand it down enough to fit into the head of the screw. This was the first strike, but it didn't take too much work, so I kept on. Fast forward 30 minutes. I'm putting the new screen in, and the top right corner bracket snaps off. This and the screwdriver frustrated me dearly. I deemed it non-detrimental, and again, kept on. All in all, my screen is fixed and looking good as new. But I did have to sacrifice a screwdriver in the process. And the screen fits, like I said, kinda strange.
If the screwdriver won't turn the screws, it's not you, it's the screwdriver. Also, be sure to wear latex gloves, the motherboard contacts don't like your grimey little fingerprints all over them.