It took me a couple of hours to get this together, and I am pretty darn good at assembling this type of stuff. When it came to put the two sides on, I realized that something was wrong. Basically, I think two of my pieces were mis-marked, as I took it apart and put it back together a couple of times following the instructions. However, I was able to figure it out and make it work. Then I discovered that they gave me two top pieces, so I just did not screw in the bottom piece in the middle. Not really a big deal. It is a pretty bookcase - modern and different. Just a pain to get together!