Have to agree with you Mark, it's absolutely essential to have some knowledge of what your about long before setting up any kind of business, and not just how to do the job, but run the business at the same time without losing profits, benefit of the doubt is one thing, but the question it's self indicates that this person has little or no experience, when running a business all work and services provided have to be guaranteed and the proprietor must be able to find the solution when it goes wrong.
Painting X-boxes is a fantastic enterprise, it means you only have to work a couple days a year leaving you time for other things, like maybe a day job which you have some experience in, I my self have an X-box and Play-Station 3, these are encased in my television cabinet and I can only see the front of both, and I have noticed when I play any games I can't actually see either of them so I can understand why anyone would want to pay to have it painted.
My advice to E.Z. is to take a good long think about what your planning, starting a business requires a clear head and some market research, you need to be sure not only if there is a market for what you plan but also that there is a hole in the market that you can fit into, a business that goes tits up will usually cost you more than you wasted material but can also cost you the roof over your head, don't forget that every bank will throw money at you when you start, but only because they know they can ruin you when you fail.
At the end of the day it's your choice, and as harsh as this all sounds, I would rather save you the pain and suffering of unnecessary failure.