Of course he will need to know, what he is doing - and you with your questions helping him like hell lol. I would prolly overkill you with any question about computers by asking stupid technically overfilled questions instead of giving you simple advice with link to ready product.
Painting is simple - once you know what to do, same with stripping Supra engine or setting up good computer. All you need is person, who will not try to show off with their proffesion, just someone, who will explain step by step how to do this or that - in this case paint bloody kit car in simple colour, using standard tools and premixed stuff from paint shop - we can assume, he do not have proffesional painting chamber to do it, so garage have to be enough. Now - do you know, how to advice him properly or will still taking a piss? If you happy to make walk through - do it! Even poor me see he do not have idea, where to start!
@DannyW
http://www.neilslade.com/Papers/Painting.html
This should be good start for you - if you scroll down to around black car picture, there is quite few basic info and tips, how to paint your car and what equipment to use.
http://www.carcraft.com/howto/24820/
Another one - combine with first link