Easy to put together until I got to step 11. Then, Part C in the drawing did not look like anything I found in the box. Was ready to return it to the store (although partially assembled through step 10) when I decided that there was another piece that I had that did not match anything in the parts diagram. Turned out that was the "missing" piece--the seat. In the parts diagram and in steps 11 & 12, Part C looks like a flat piece, but it is definitely a curved piece of plastic for the seat. All ended well as the seat snapped into place just fine. Just a little confused by the drawings.