The instructions were sufficient to install this thing, but they were pictures only (without words). Pay close attention to the layout of the shelves and the direction of the screw holes in the photos. The orientation sometimes changes between steps. 

Use the screw hole indicators in the photos as a directional guide – they are not exact in number in the illustrations. 

When viewing the bookshelf from the side, you’ll see the screws. It would be nice if these were white like the bookshelf, so they were less eye-catching.