The display had been damaged by a swelling battery - replaced earlier.
I followed the link to the repair instructions, which began with the Video Overview. The video was very well done, but included steps for removing the front-facing camera and LCD frame, which I did not need to do, but did do as I was following along with the video. Also, the video does not include the step of disconnecting the battery cable, which the step-by-step instructions imply is essential before disconnecting the front panel assembly cables. I did not disconnect the battery before disconnecting these cables, but did do it before reconnecting the cable for the new display assembly. I had some difficulty picking up the home button cable - I finally had to use the point of my pen knife to pry it up, as none of the tools in the kit would get under it. Everything went back together with few problems abd the phone appears to be working fine.
I would recommend adding three things to the video: (1) A recommendation and demo of battery cable disconnect. (2) A stopping point that says If you are replacing the full assembly, skip directly to home button removal. (3) Some additional advice about lifting the home button cable. You might also recommend which of the phillips screwdrivers to use for which screws.