Finally we got to work and medium sized helper and me carried the big box into the house. Now of course the little helper had to be right in the middle of all the commotion in Bella's room. After the medium sized helper sorted and counted all our hardware the little helper spread it all over the floor. We managed to get the screws laid out and he managed to take them out of the holes. Finally we had all pieces set up and got the second side on top we can hear little helper working really hard and seeing him pulling and pushing and going "aaaaaaaar" to get all pieces down in place. It was hillarious. While finishing tightening the screws all shelves got inspected by medium sized and little helper in various positions until the bookself was standing upright.
As soon as it was halfway filled with the books and games and knickknacks it was supposed to hold the bookend jumped in place and got comfortable. I wished all my household items would find their places magically.