Very easy to assemble! The cubby is pretty big, which I was worried about it being too small. The only problem is the post that supports the back corner of the cubby didn't have any threading for the screw. It was just a hole. It's not big enough to just slide the screw into either. I now have to figure out a way to get that stabilized because without it, the whole tower is VERY unstable. For ive slid the tool that came with it in the hole for at least a little support. Aside from that, it's a very nice tree and I can't wait for my boy to be able to use it!