Super easy to put together!  If you can put a screw in a hole, then you can put this together.  Do not be discouraged.  I love the multi-levels and so does my cat.  He climbed himself all the way up to the top.  Nice and sturdy construction.  I was very impressed.  He didn't run to it right away as some other reviewers have stated, but by the next morning he was all over it.  I'm hoping this will keep him away from my couch for good!