My daughter and I assembled it this morning.  Once completed, we noticed we put the top shelf wrong.  So we took it apart and did it again correctly.  Just make sure to remember that the glass that goes on top of each shelf needs to rest correctly on the top.  So when you assemble it, you do it well the first time. 
It was not difficult at all and once completed and cleaned, it looked beautiful.  My daughter is soooo happy with the purchase.  Excellent choice.