Just replaced my stock dv with this one
http://www.ecstuning.com/Volkswagen-Golf_V--2.0T/Search/Diverter/ES263879/
The install was quick and easy just using a set of 12,000lb rhino ramps.
Just wanted to pitch in and say yes this can be done without too much issue using an allen wrench and a shaft from a screw driver ( as Travis MKV said).
Also when un-doing the electrical plug, i found the easiest way was to push the whole clip together ( just like you would as if you were putting it back together) then insert a standard screw driver into the square box looking thingy on the top of the clip, and just twisting the blade a little bit, you will head a slight click you then just simply pull the unit apart.
Also make sure when removing your origional dv that the yellow o-ring ( the big one that goes around the outer most part of the unit ) comes off. Mine stayed on the car when I took it off and I almost missed it when I put the new one back on.
GREAT DIY mose6161!!!
Thanks