Let me go off in a different direction on this one. I'm not a lawyer or accountant, so I can't offer legal or financial advice. I'm not a psychologist, either, but I am going to give you some advice regarding motivation and behavior.
Many people facing foreclosure are in denial. They don't believe it'll actually happen. They're convinced their uncle, or cousin, or brother will lend them the money. Or they think the Bush Administration's new initiative will save them. Or that they can raise the money somehow, from somewhere. And, frankly, people who made bad decisions that led to their financial problems have demonstrated that they make bad decisions and often have poor judgment. Now that they're facing foreclosure, why should they suddenly acquire good judgment and make only good decisions? They don't.
You say this person "does not have any legal representation and does not plan on getting any." Does that sound like good judgment to you? No, I didn't think so.
Now, you're to be commended for trying to help someone, and I hope you're able to. But recognize that this person has made, and is continuing to make, poor judgments. So, be very careful. Be prepared to be attacked when you're only trying to help. Be prepared to have your motives challenged. Be prepared for this person to not act in his/her own best interest.
As the other commentors say, sure, it's possible to purchase the home via a short sale without hiring a real estate agent. Though the basic requirements are the same for most lenders, many lenders have their own specific set of documents and requirements. Your first step would be to get the person's authorization to speak directly to the lender, and then to request the lender's short sale package.
But short sales are very tedious, time consuming, and complicated. And, as Christopher said, there's really no advantage in making the attempt without an agent. And you don't just want any agent...not even a good, experienced, knowledgeable agent. You want one who knows how to do short sales. And also--and I say this from personal experience--you need to be working with an owner who really, truly, is willing to do a short sale.
Hope that helps.