It took me about an hour and half to fully assemble this tree. Everything is mostly twist on or using an Allen to screw in, which comes with the parts. My cats loved it even before I got finished putting it all together!  I do recommend using both the instructions and the picture for guidance. It is very complicated to only use one without the other.  I also recommend organizing and setting out the pieces before starting so you don’t get confused  with sizes. Overall, I’m very happy with the tree, the  easy assembly and the sturdiness of it! Great investment!