For PE to work, yeah, it eventually gets very detailed. But you get there gradually, the whole point is to be upset but not overwhelmed or retraumatized. I encourage you to share your feelings throughout the process wither T so he knows how you are doing--the more feedback I gave my T, the better he could adjust the exposure.

Imaginal events are certainly used in the hierarchies so I think your example could be, too. The idea is to help de-trigger stuff that is making up life challenging. I did a lot with imagined meetings to prepare myself for real ones.

Here's more information on PE: Prolonged Exposure