Very easy to assemble. Step by step instructions and tools provided, with every tree. Find a decent size area and lay out all the tree parts and hardware in front of you. Always start with the tree base and work your way up. Pay attention to the length of the bolts and what part of the tree they hold together, some bolts are longer than others they are intended usually hold the condo part down. If you use the wrong size bolt in the wrong part of the tree, unfortunately you will have to retrieve it back as its intended for a different part and the short bolts just wont be long enough. Pay close attention to the drawing instructions.