The therapist needs to have a good understanding of, well, basically what FKM just said. Not all Ts are trained that way or even have the capacity to understand that. The therapist also needs to have a solid sense of self, self-trust and willingness to reflect on themselves deeply. They also need to be willing to go on a bit of a journey with the client, which will involve feelings being raised for them too. They need to have the capacity to tolerate that, and also not to lose their own grounding. It's hard. I'm also very lucky in that respect.