I echo what Perna says. For me, when I start to worry, it's always because I'm imagining a negative outcome of something in the future. However, I don't know if it will be negative or positive, I just default to the negative prediction.

Imagine what it would be like if the conversation went really well. I'm not trying to say that if you think it will be easy, it will be, but what would the session look like and how would you feel after if it went well?