Can you be a lawyer for yourself?

I can be a lawyer myself, but I need to have relevant legal knowledge.

Lawyers can defend themselves, and there is only one way for lawyers to defend themselves, that is, lawyers appear in court as defendants, and the defendants can defend themselves at this time.

There are three kinds of criminal defense in China: justifiable defense, which means that criminal suspects and defendants defend themselves; Entrusted defense means that the criminal suspect and defendant sign an entrusted contract with a person permitted by law, and others will defend them on their behalf; Designated defense means that under special circumstances stipulated by law, the court appoints a defense lawyer to defend the defendant who has not entrusted a defender.