The guide is excellent, but few things are missing. You will need double stick adhesive to reattach the battery otherwise it will rattle inside the case. Also the lightening cable need double stick tape to stick to case. Its highly recommended that you have a roll of 3M thin double stick tape before you start. The guide also left out that you need to remove and reinstall SIM card lever and three mounting clips. Plus you need to pull off various rubber components all around the old case including those that secure lightening, speaker, audio jack etc to the case and reinstall them in the new case.