I have bought and fitted two now and they were pretty straight forward to fit, I think if you set aside half a day for fitting you will have plenty of time.
I bought 'Witter' towbars on both occasions from http://www.towbarwarehouse.co.uk/
and fitted them to my Passat Saloon and the other to a Passat Estate.
It was simply a case of unscrewing the bumper, then unbolting the impact/crash bar. Then slot the assembled towbar inplace of the the impact/crash bar with the bolts provided.
Wiring was a breeze for single electrics and the instructions supplied are quite clear on this subject
I gave mine a couple of coats of smoothrite a few days before fitting to keep rust at bay.
Saves paying fortune for someone else to fit it.
If you would like to know any more please feel free to ask