Headunit installer recommendations - Oxfordshire area?

Hi, I've just ordered a Pioneer DEH-P3500MP (and some aerial adaptors) for
my '96 VW Polo from Car Audio Direct (cost £130), and now need someone to
fit it (unless its likely to be a very simple DIY job - what do people
think? Would I need any special tools doing it myself?). Could anyone
recommend someone reliable in the Oxfordshire area (preferably Oxford) to do
this? Also, how much would this normally cost - £25?

I've seen the website for Oxford Car Audio http://www.oxfordcaraudio.co.uk/
does anyone have any experience of them?

cheers

Paul