The Catio came in 3 large, flat boxes. There are many parts to this kit, but everything was marked. The instructions were very basic, visual only. The key is to take your time and organize the parts in order of assembly. Double and triple check the instructions before screwing the numerous panels/parts together. The only tools needed are an electric drill and an electric screwdriver. It takes 2 people to put the Catio together.  The Catio met our expectations and while it isn’t perfect, it is a well made product. Wayfair had the best price and the free shipping made this purchase painless.