I've gone through the tutorial by Grudd a dozen times and cannot get the desired results. Below I attached the skin and a sample render, Can't seem to get the tires black without screwing up part of the wheel, nor can I get the chrome effect, Transparent windows etc.

Possibly something I am doing wrong but none the less I have followed the steps, It can't be that hard now could it? Is there an easier way or another program the majority uses to get these great results?

This is amazing.
http://www.gjl-network.de/lfs/render/caipi_rear.jpg
Thanks.

you must click the button with the white box (this is in materials list) with the blue arrow extending, i believe its 3rd from the left

make sure you have the specific element highlighted, which happened to you here, all you did was apply the skin to the car as a whole, what you need to do, in the modifiers list, go down to element, and highlight out the window parts of the car, and then apply your window material to that, then do interior, tires .. etc.