If you are interested in representing yourself, why not just not deal with the agent thing, and only submit to publishers who accept unagented MSs?
See being an agent is a lot more than just placing a MS with a publisher. And to think it's just that is very naive, and a little offensive to agents. Your analogy is also slightly off. Many doctors do treat themselves, and many lawyers represent themselves. What your situation is more like, let's say you get sick and need to see a specialist. And you decide instead of waiting for a time that a specialist can see you, to become a specialist yourself. It takes years and years to become a doctor, and the only reason you would be doing it would be so that you could take care of yourself. It also takes years to become a successful agent, to build up contacts, to learn the trade, to apprentice with a larger agency before opening your own.
If you are only doing it to rep your own work . . . and not because you would like to become an agent . . . then dude, go it the old fashioned way. Or, as I already said, bypass the whole agent thing in general.