Very easy to ensemble, if I can do it any body can.  The only problem are two Top Cross Rails only have holes on one side instead both side, therefore if you can make 3 holes on each rail so that the long top bar can go thru than buy this, but if not than don't bother.  Thank you for the previous feed back with the warning, it took me several hours to make 6 holes, since I don't want to spend a lot of money to buy the tool.  It is manufacture defect on this particular model, I m trying to attach the picture, hopefully it will help.  Good luck