Step 8Mount the shelf
iImage Information

This is the most important part of the project. The bookshelf itself is heavy. After it is mounted, it will carry a lot more weight of the books and other items. The wall anchors will not work here. The bookshelf needs to be mounted straight on to the studs. Use a good stud finder to find the stud location. Use one of the 2 1/2" long deck screw with washer to fasten one side. Use a level to see if the shelf is completely levelled. Then, use the second 2 1/2" long screw to mount from the other side. Use your judgement to decide the location of these screws on the shelf. The idea is to distribute the weight properly. Fasten another set of screws a few inches below the first set for additional support.
The two pictures below are of the left and right divided bookshelves. Unfortunately, I was unable to mount them in a stacked design (as originally planned), so I put them at separate places.