The instructions seemed easy but the piece of wood for block 5 didn't have any pre-drilled holes and would be unstable if not included (it's the piece at the bottom) so I had to literally hammer the nail to make a deeper hole for me to screw it into the bookcase. The issue now is that no matter what I do, the product appears to be leaning. I rebuild it 3 times and it still looks like the product gets further away from the wall as it gets taller. At this point I think I'm just gonna live with it, but I'm not very happy.