This was super easy to put together.  I put it against a wall and used a bracket to stabilize against the wall.  My cats are known to leap with force and the single base is not enough to keep it from falling over.  I did not use the stabilizing pole that came with it, to support up to the ceiling.  That may work to stabilize, but I decided to brace against a wall.   I also bought some jute rope and wrapped it around the vertical poles.  The cats loved it!