I recently purchased this wood room divider to divide my treadmill and guest bed. Let me tell you! This divider is as long as my treadmill and its a bit too long so I close it up a bit more( accordion style) and adjust to the length I prefer.  If you want to insert the shelf boards by yourself, I recommend to close the divider and put all three boards in the holes and slowly open the divider while and keep adjusting the boards until the room divider completely opens up with the shelving.