Very easy to mount. To fit straight, do not tighten the screws. My cats have adopted immediately, which allows me to keep the free sunbed for me :) It is very well packed when we receive it, it really seems not bulky and as said, the installation is very simple without screwdriver all is provided. 4 screws, the appropriate key, and presto, we assemble all with a small manual, but frankly, there's not to take the lead.