In order to put the correct screw back where you took it out mark the head surface and a small dot beside the hole with a pen. Use coloured pens if you want the exact location for each screw/hole. This goes for steps 17, (23) and 29 too.
In case of broken glass you can make the suction cup much more effective by covering the glass with a broad piece of translucent tape which eliminate air leakage through cracks in the glass.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
No reputation gained yet.