As all have said, you need two people and I didn't have anyone else but did get it together.  Was a little disappointed in the quality.  I have a number of animal crates and this one is relatively flimsy compared to others.  I like the locking doors and having wheels help - do appreciate that they put in a few extra screws because they are so small it was difficult to put the screws in around the wheels.    Would I buy another one of these - no.  I would probably invest in a higher quality pen.