Nope. A lawyer who has him/herself as a client is a bigger fool than just any lawyer. Nope. You get your own lawyer. That way, someone unattached to the emotional side of the case is thinking clearly.
I agree in general principle, and on most cases people should have lawyers to represent them. But...
O'Neill spent the past few months making his case against John Kerry--the same exact case that would be made in the courtroom (proving that his charges are true, except he would have the benefit of discovery). He probably would have lawyers on his defense team to help him, but I think he'd want to be the big dog. SBVfT was his baby, bringing down Kerry was his project, and this would be his chance to nail Kerry once and for all.
He's also had three decades and a Presidential campaign to deal with the emotional side of the case. I doubt he would screw it up because of his emotions.
Of course, it's not going to happen, because Kerry doesn't want to face up to the truth.