That's a good point. Many of these techniques can be done with the arm in a different position (e.g., hanging off in a T-pose while face down, hand resting on the abdomen when face up, elbow propped up on a pillow), and especially for a client with frozen shoulder, their comfort is paramount. I find that I can get a lot done without ever needing to challenge a client's comfortable range of motion, even if it's quite limited.

I look forward to it! 😁

My secret here is to rarely, if ever, haul myself up using my back and hip muscles. If you see me leaning way over, that's because I'm pouring my bodyweight into my client (often distributed between two contacts). As I stand, I get my hips under me, and I'll assist the movement by pressing the client away with my arms. Basically, I think that a little bit of a hunched posture can be fine, as long as that bent back is getting to be relaxed. Something that I say to students is, "I'm currently burning 0 calories."

The mother hand should always be firm and confident, but you might choose to let it be fairly passive and rather light, while the other hand is the star of the show, offering deep and specific pressure with grouped finger pads (for instance). You might choose to give both hands similar pressure, perhaps using the mother hand as a spreading tool, dragging fascia away from a fist travelling up the spinal erectors. In other words, I don't really have a specific prescription for how much pressure to use with the mother hand. Let it be firm and broad and comforting, and otherwise you can play with different pressure levels and different levels of activity versus passivity. The easiest way to get a quick handle on this would be to grab another massage therapist (or experienced client) and say, "hey I want to experiment with adding a second contact to some of my techniques." Good luck, have fun!