This expression means that representing oneself in a legal matter can be a very risky proposition. The phrase implies that someone who chooses to act as their own lawyer in a legal proceeding is likely to make mistakes, overlook important details, and ultimately harm their own case. This is because the legal system is complex, and there are many laws, rules, and procedures that only trained legal professionals know how to navigate.
Lawyers have a wealth of knowledge and expertise that allows them to handle legal matters effectively. They are familiar with the laws, procedures, and customs of the legal system, and they know how to argue persuasively in court. Additionally, they are trained to be objective and to make strategic decisions that are in their clients’ best interests.
So, in short, the expression “a man who is his own lawyer has a fool for a client” is a warning that self-representation in a legal matter can be a costly mistake. It’s usually best to hire an experienced lawyer to handle legal matters to ensure the best possible outcome.