To keep the screws organized I suggest having a piece of corrugated cardboard that you can draw a crude drawing of the computer and then push the screws into the cardboard in the appropriate places in the picture.

That being said I thought of this after I mixed up all of the screws and now the computer won't boot due to a screw being in the wrong place and shorting out the screen, so if you have a drawing of the screw locations I would very much appreciate a copy. Thanks