As I look back over all the comments, I'd try skipping steps 17-25 and 28-34. They don't look to be necessary to replace the Lightning connector and just make for more potential problems reconnecting everthing
I agree the #000 Phillips driver didn't work. I happened to already have a #0 Phillips that did work much better.
I'd agree with this. At I'd least give it a try.
I didn't see this suggestion until after I had problems reattaching the back-facing camera and display assembly to the logic board. Actually damaged the camera connection and had to remove it so the display assembly connections were good.