I had to wait an extra week to assemble this after delivery, because one of the fixed shelves was damaged and needed replacing. Customer service made sure that the manufacturer sent out the replacement shelf promptly. Even though this unit is heavy, it can be assembled by one person. When aligning the back of the unit to the sides, as illustrated later in the instructions, a suggestion would be to place the frame on one of its sides, then prop the back on its side flat against a wall, then push the frame toward the back while lining up the cam locks with the metal posts. To make this easier, flatten the cardboard box the unit was packed in, place on the floor and use as a work surface. This will help in protecting your flooring surface and gives you the extra maneuverability in moving the assembled pieces around.
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After having this unit for a while, I noticed that if you put heavy, hard-covered books on the adjustable shelves, over time those shelves will sag in the middle. This was most noticeable on the adjustable shelf above the bottom fixed shelf. Because I only used two out of the three adjustable shelves, initially, I had one in reserve that I placed upon and doubled up on that lower shelf, to give it more stability. Something to consider when buying.