Really good clear guide. Took my time with every step, and found things easier after magnetizing the screwdriver I had and at times using a magnifying glass. Also, found it easier to tape down the power, mute and volume buttons when putting the ribbon cable in and once connected it is well worth testing movement of these buttons before continuing. I did struggle getting the logic board back in (taking care not to snag the grounding tab), but found this easier after loosening the screws fixing the dock connector. The tip about putting the SIM card holder back in before fixing down the logic board was very useful. Very pleased to have a fully working phone now after spending 6 or 7 hours replacing the back cover and ribbon cable. This was all quite daunting at first, but after taking care to follow the steps to the letter and reading some of the comments then don't believe it was quite that bad in the end.