If you have a cellular antenna make sure you disconnect it from the motherboard before removing the motherboard or you will rip the ribbon.
Reinstalling the upper component bracket was tricky for me. It is difficult to get the bracket in proper orientation to replace screws and under the flaps at the same time.
The volume on my IPad Air 2 was muting sporadically on its own. Replacing the volume cable fixed the problem. Great tutorial.
Play close attention to the orientation of the microphone and ribbon cable for reassembly.
Be very careful when replacing the screws not to lose them. They are micro small. I would even think about ordering a couple extra of each size just in case.