Depending on the conversation, it could also be an uncomfortable one all parties involved but the only through it is through! Keep in mind why you want to have the conversation in the first place and the importance behind it.
Everyone is different, I like to go in and get straight into it but it also helps writing out points or maybe practicing what you’re going to say. Keep your head as leveled and fair as it can be. If needed, take a walk and grab some fresh air afterwards before analyzing how the conversation went.
Wishing you the best of luck & it’s all going to be okay! (-: