Citaat van David Pagan:

I did this. It takes time but you do get there eventually.

A big help for me was to have a square of cardboard(corrugated fiberboard to be precise) the size of the mac next to it as I took out the screws. As I took a screw out I pushed it into the cardboard and made a simple reminder of what layer it came from.

This kept all the screws separate, safe and quick to remember.

Of course I some soft material underneath as well just in case something did slip out.

I print out any of the pictures showing a number of screw positions and then stand the screws on their equivalent locations on the picture. Makes steps like 13 really easy when it comes to reassembly.