Yeah, IANAL but I'm in the legal field, and I watch people try to handle their case pro se, or for oneself or on one's own behalf would be the literal translation. It generally means someone didn't want to pay a lawyer and they have time to waste, and they're also a little crazy. And that probably sounds unfair, but I have yet to work with a pro se litigant who I thought was a rational, grounded individual.
Entering litigation is expensive. Trying to solve problems before litigation is encouraged, even by judges. Lawyers are a last resort, and they will make it very hard on the other side.