Make sure you pay attention to the diagram on the first couple steps. The image does indicate the orientation where seemingly identical components needs to be. There is no wording on this unfortunately. If you happen to assemble the whole thing and realize you cannot attach the top part at the end…like me, well, you’ll be able to keep the main frame, intact and disassemble and reverse what you did at the beginning fairly easily. using a wrench socket bit that fits this Allen wrench size helped to quicken the process and usually finish it off with the actual Allen wrench.￼