Hi Justinus,
As others have said, it really is quite straight forward to fit. We ran an article on it in a previous issue of our Club Magazine (Driving Force) and we've also put it up on our website for anyone to access. It describes all the parts required and how to do it. Take a look here:
http://www.p6club.com/content/fitting-boot-mount-spare
If you decide to go for it, you can take your time collecting the parts from eBay and/or the usual P6 suppliers. If you have any queries about it, as you've seen, there's plenty of help here
Cheers,
Bri.