I'm teacher for mechanics(?) in Germany. I try to teach pupils from 10-16 how to work with wood, metal and elektronics. We are building small things, but also repair sometimes an old engine or a bike. So fixing is my profession. :-)))
First: English isn't my mothertongue, so please excuse mistakes.
I also lost the camera. But it wasn't a problem. At the end of step 28 it was quiet easier to pry the camera without being careful about the motherboard. Only the reverse was done at step 18 again. I put the camera inside the hole and closed the connector for the data. After that I connected the motherboard again with the display and put all together back. So everything was at its right place.
At the End everything was perfect. I'm as pleased as punch!