Be clear about how you feel and what you want. Look at the topic from their perspective. If things don't go as planned, take a break. Listen actively to understand the other person's perspective on what happened.
Recognize the feelings behind the arguments and accusations. Paraphrase to see if you have it. Try to unravel how the two of you got to this place. Instead of getting nervous beforehand, change the way you think.
Think of it like another normal office conversation. You must assume that the meeting will go well. Go in with a confident attitude and get to the point. By approaching the situation in a positive way, the energy you bring will also be positive.
