2 - 5 Minuten
My iPhone 4 was in great shape except for scratches on the camera lens. After suffering with fuzzy photos for a while, I decided to see what iFixit could do for me. I found the transparent replacement back for under $30. How could I not jump at that?
As usual, the iFixit instructions were great and the repair took only about five minutes. My biggest problem was getting the back slid in fully so the screws seated properly. It took a couple of tries.
Be careful when unpacking the extra screws. I managed to flip one up in the air. Luckily it landed on a white sheet of paper.