The polycarbonate sheets on both sides will bring some protective films, self-adhesive, to be removed prior to installation. It is important to note that the top face has a UV filter, and it is recognized because the sheet indicated with a mark. That's the one that pulls out at the end, in order not to lose the correct position of the plate.
Make sure that the support structure is stable, rigid and without imperfections, in order to protect the polycarbonate sheets.
Go up the sheets one at a time. If it is of a greater height, you must condition the guide slide.