What Restrorob said, ...
But, I would add one note on procedure. Do the work on a clean, smooth surface, not in the gravel, grass, or other such place. The parts are small, and some have a spring-load to them when removed (e.g. #17). Also, the spring beneath the key is subject to "leaving the scene to places unknown."
If one of these little parts does "leave the scene," finding them on the clean, smooth surface is much easier.
... been there, done that!