There are two brackets that have to be installed on to the rear absorber. they take 3 three screws each and you have to predrill the bar before installing the brackets. The bike rack actually comes with instructions no where to put them. You do have to loosen the tail gate (just two nuts), and move the rear tail gate seal to drill some of the holes.
DIY..? if you can give your own car a tune up, or build a bird house, yes its DIY but if changing your headlight bulb is a challange then NO its not DIY
(edit)here is a link for the instructions. half is in german and then there are a bunch of spec. pages.
http://scp-parts.com/pdf/baserack.pdf