Step 8: Keep cover screws organized.
Make sure you shutdown your computer before you work on it. If you're not using anti-static mat, lay it on some soft surface "upside down" or "belly up", whichever you like better. Make sure your screwdriver is fitting snugly and start with any screw. It seems to not matter where to start.
Once you have a screw in your hand, stick it on the double-sided tape. Work them one by one laying them out in the same pattern as on the back of the computer. See pictures for details.
Notice, that some of the screws tips are different -- there are some cone shaped while others are flat. I don't know what purpose that serves, but it's safer to just keep them in their respective places.