I thought I'd done something wrong because my phone would not turn on.... even after a few hours. I finally charged it overnight and then did a hard restart (holding the power button and home button at the same time) and it worked! I have no experience doing this sort of thing and it was a little intimidating, but the video really helped, and it was manageable... not easy, but if you have the motivation and steady hands you should be able to pull it off.