Just follow these simple directions: tools needed- 1/16" drill bit (preferably an electric drill to go through window ledge), and a hammer for what should be 1st step - those braces. They will NOT snap into perch slots w/o a hammer!!! Also recommend the bolster and I turned it around from illustration so kitty can lean against it while looking outdoors.  Our cat LOVES this perch, sleeps on it all night, too, so he won't miss anything!