Those screws are truly tiny.

Mi Problema

Replaced the SuperDrive optical on an aging MacBook Pro, since the old one had failed.

Mi Solución

This repair takes a while (I'd say leave a half hour at least), since there are about a billion tiny screws to come out and keep in order. Some of them are seated pretty securely, and so you'll want to have a good small phillips head and a table where you can apply leverage. You'd be screwed if you stripped them...

Mi Consejo

Have good light and a level working surface to do this - those you'd be screwed if those screws fell on the floor...