Step 2 is going to make you want to chuck the entire thing out of the window. Because of the crossbars there is limited space to turn the screws. Luckily there are only four. After Step 2, it's pretty straight forward but I recommend you use a drill with a phillips head screwdriver to drive in the screws. Just easier. I ordered 2 of these and the second one had a missing part - they quickly sent me a replacement.  

Docking 2 stars for the HORRIFIC STEP 2.