When I did this just last night, I compared the bad lightning connector setup with the new one from iFixit, and noticed that the new one doesn't have the small metal bracket that holds the connector for the home button/fingerprint scanner in place. This bracket is right under that connector and is what the metal cover in step 8 connects to. These instructions are so detailed everywhere else, that I was surprised that this wasn't mentioned. So be careful to remove the bracket from the old connector, and put it back in the phone during reassembly. I did not need the adhesive to hold the wires, because the little cover you remove in step 8 will hold things in place.

I also noticed the missing tape on the antenna wire, and the missing mic cover, and transferred them to the new connector as well.