Step one we begin by removing the screws from the outer case. There are three on the bottom, and two on each side. Be sure to remove the correct screws (as indicated) on the bottom. All the screws are of identical size.
With a white J1 these screws are conveniently black, the ones on the side are white.
You can then slowly open up the camera and remove the two side plastic pieces. One may take a bit of a wiggle to get out, but don’t force it. One of them will probably fall out on its own. Make a note of which side is which, as it will make assembly easier.