Take a break before expressing your anger. Raging at someone in anger never helped.
Find out why someone's behavior bothers you before confronting them about being upset. Why not chronicle your feelings next time?
Direct but courteous communication is key when approaching an angry person. Avoiding the issue won't help.
Despite the temptation to rant, let the other person speak. Open the floor after explaining.
Recognizing your anger is vital and valid. Remember that you may be angry and empathetic.
Conflict resolution requires compromise, like many human interactions. Openness and cooperation are necessary for compromise.
Rest. Considering these guidelines is fine, but sometimes the conversation will get hot. Allow yourself to retreat if necessary.