Don’t do it. You could wind up in the hospital, the court system, or the morgue. Use every available means NOT to fight. Apologize. Make it right. Draw attention to yourself and the situation. Clearly state that you don’t want any trouble. Call the police.
If you must fight, fight like your life depends on it. Commit fully, don’t hold back, and stop as soon as the threat is neutralized. No one who picks a fight plans on losing, and you never know what advantages they may have.
Every situation is different, so trust your intuition and react quickly.