Whenever I connected my iPhone 4S to my computer, the connector would intermittently go in and out. After trying several cables I knew worked, but with the problem persisting, I figured it was probably the connector.
I was initially terrified at the thought of taking apart my phone. However, I just followed the instructions on the website, and it could not have gone any smoother.
Take your time! Take your time! TAKE YOUR TIME!
Be gentle, don't force anything!
When removing parts that are adhered down, use gentle pressure to gradually pry them away rather than just forcing it.
If you don't have the pry tool, use an old gift card. That's what I did, and it worked just fine.
Read the instructions ALL THE WAY through BEFORE beginning assembly, so you know what to expect ahead of time.
Take a piece of paper, then draw several large circles on it. After you remove a pair of screws, place then inside one of the circles, then label the circle with the number for that assembly step. This will ensure that the right screws go where they belong.
Buy a GOOD SET OF TWEEZERS and an 000 size screwdriver.
Wearing surgical-style gloves will keep finger oil off of critical parts. It is worth your time to purchase and use them, as this oil could degrade connections between parts and reduce performance. Nobody wants that.