Just installed my cat perch and it was very easy - took me 5 minutes.  I used the three screws to make it stronger.  Took a little while for my cats to understand what this new ''thing'' was but after 2 days they got it ! a trick I used: I put a bit of food to attract them at first.  But now they understand what the goal is: to watch whats going on out there ! I have 2 cats and one of them is pretty fat.... was afraid it would'nt be strong enough but it is indeed ! see Lea in this picture.