Difficult to answer. I came across craniosacral therapy (CST) initially through a practitioner who had only just trained. I was seeing her for shiatsu massage. This was really early on in recovering memories and working on trauma, and we tried CST because I trusted her so much and knew so little at that point. She wasn't experienced enough to know what to do with the extreme nature of my reactions so I then found a CST therapist who was the opposite - very, very experienced, really knew about trauma, was a teacher at one of the country's leading institutes etc.
So my experience of CST (with the second practitioner) might not be typical. He was so advanced and attuned to what he was doing that I was aware of only some of it. I never told him any details, only that "I experienced a trauma". However, he could clearly tell that there had been more than one, exactly what they had been, and at what age.
A typical session would consist of me on the way there doing a visualisation that I'd be safe during the session, that anything that was healing would be accepted by my system but anything that was too much right now would be gently put to one side. Then my CST therapist would ask me how I'd been, and was really only interested in somatic information. I was seeing someone else for psychotherapy. Then he'd hold my feet and get an overall sense of things, and that would tell him what parts of my body/system wanted attention at that point.
Because it wasn't psychotherapy, everything was based around body/central nervous system reactions. All I was aware of him doing was placing his hands on different parts of my body. I told him anything I was experiencing, and sometimes he would ask me questions, but a lot of the time was silent. He'd give me feedback about what he was sensing and how that shifted as he worked - for example, that he was feeling a release of tension held in my shoulder or whatever. Occasionally he'd be really quiet or would ask his higher power, out loud, for help - this was never a good sign because it meant he was sensing something really bad, but I felt he was always in control of it, which he was.
One thing he sensed was that the fear had been refrozen so many times it was now fear of the fear of the fear.... which was very true. It was helpful to have him explain things like this because all I experienced was fear and I wasn't aware at that point of what that was composed of. Through working with him over time, though, I became much better at scanning and sensing my body myself. He actively taught me this.
Both he and I were very strong on staying safe and away from things like flashbacks or distress. With the newly qualified CST therapist I saw right at the beginning, she just didn't have those skills, and I imagine that a lot of therapists are somewhere inbetween these two extremes. With her, I felt the safety aspect was all down to me, and that was too much. I think the therapist has to have a good knowledge and understanding of how not to trigger too much. I think it's common for the client to keep giving feedback to the therapist throughout the session for that reason. In my case, though, I didn't do that and it was fine because he was so skilled.
Between sessions I would shake and shake, but never during. With the first CST therapist, it was during too. I did a lot of work too. As well as psychotherapy, journaling, allowing the shaking (had to make special arrangements at work so I could accommodate this instead of shutting it down), I did spend time on visualisation and preparation for the sessions to be both safe and healing.
The shaking would always be preceded by going cold, especially in the soles of my feet which would get so cold it was acutely painful. The shaking wasn't entirely like the kind of shaking you get from being cold, though. It was like convulsions. I would lie down on the floor with a blanket over me, and I'd shake so hard my body would lift off the floor.
I experienced a lot of what's called unwinding - the body going into positions or movements from the trauma. I have to be honest and say this was freaky and distressing, but I kept reminding myself it was processing. My arms would actually move vigorously as if trying to free themselves of restraints, and other things much worse. For some time I would wake up with my face fixed in a grimace which was terrible when I caught sight of it in the bathroom mirror - it was like a mask of trauma.
I also used to wake up sweating but very calm and even peaceful. I think in the book, Levine says you may find yourself perspiring in your sleep. I hope it's not too much information to say that drenched bedclothes were more like it in my case, but it used to make me feel that I was throwing out the trauma and ridding my body of it, so I welcomed it (and changed bedclothes frequently, and wrapped myself In cotton nightclothes before falling asleep).
With all of the things, even though they could be difficult in themselves, overall they felt healing and they felt like a release (which they were).
Another thing I began to experience more and more, and which has now far overtaken the shaking, is what I interpret as the "healing vortex" that Peter Levine talks about. I feel what I call a loop of energy circulating, either around a point of my body or between two points, for example between my wrists (unfortunately my wrists were integral to trauma). I did used to experience this during sessions, as well as outside them. It's an amazing, healing feeling and I've always loved it - as if my body is righting and realigning itself.
I'm kind of in awe that you found a psychologist who does craniosacral therapy and somatic experiencing! Wow. I often wanted to see one person who combined different aspects, instead of being split between two people. In the end, I believe we find what's right for us individually, and there were advantages to seeng two separate people. I can imagine a lot of advantages in seeing one person who does both, though.