Yup I've done Trauma Sensitive Yoga for 1.5 years with a RYT-500 from JRC. I did a year in a ladies group but my T now has me in a private lesson since becoming more "present" & less dissociated -- I tend to get pretty keyed-up in group (example; the ladies would be doing savasana and pretty much all blissed out while I'm against the wall hyperventilating).
My experience: Instructor is a M.Ed in Special Needs, train-the-trainer yogi since '95, does NLP & Reiki (though not with me). We start the class off with "whatcha-been-up-to" chit-chat, where-are-you-at-today discussion (I dunno, here I guess), then she asks what I wanna work on that day (shrug my shoulders each week so you'd think she'd be done with asking, lol).
I set up my space, back to the wall. Have a standard foam yoga mat, 2 cork blocks, a folded wool blanket (my elevated seated "throne") and a cushion-y bolster (like a hard body pillow). She sits a good 5 feet away with our mats facing each other but a little offset so I don't have to make eye contact much when I get antsy.
Occasionally she'll play her singing-bowls for a minute or so (more-or-less okay with 'em). Sometimes she plays Indian piano & flute music from Spotify, other times it's silent except for her voice. Room is comfortably lit (not dark), good carpeting, no mirrors, windows stay covered with dark shades.
She starts me off with pranayama breathing (although for the most part I'm not so much on all the fancy-pants yogic names of stuff). She'll guide me verbally through 3-part breathing, stomach/lungs/chest, and she's all the time coming up with some other new kind of breathing for the week. Lots of grounding & resourcing. "Let's return to your breathing"-kinda stuff. Sometimes do Lion Breath -- look it up, it's hilarious!
My 'go-to' pose is Seated-Circle Rolls; hands on knees, sitting criss-cross/apple-sauce style, roll my upper body forward and backward, left to right, matching my inhaling and exhaling. Then do some neck rolls. She has me return to these each time she catches when I start to hold my breath; directs me to put my tongue against the back top row of my teeth to stop clenching.
We do some seated body twists, legs to the side, outward extended, flexed, butterfly, stretch the hips, modified forward folds, breathing into the body space. Each pose is held for 3-5 minutes and she keeps a steady chatter the whole time so I'm not left to the space in my head. Each pose is mirrored on both sides of the body for balance. Nothing is what I'd consider painful or stressful. She tends to ask for feedback on a particular pose, where I felt it in my body (or if I could feel anything at all). Sometimes I answer her, sometimes not; she's totally cool with it. She gives me time to babble on about nothing sometimes, movies or TV when I get to a particular hard (for me) pose; other times she has me stop the pose I'm in and return to breathing when she notices I'm checking out.
A lot of the class feels very hippy-dippy to someone pragmatic like me but I've learned to roll with it as much as I can (love my instructor!). Instead of pure meditation she's trying to get me doing some yoga nidra for 3-5 minutes at the end of class; she names the 61 points of the body -- love this because she goes so fast I don't have time to focus on anything negative and can stay present (early on in my yoga process, I'd checkout entirely during meditation time -- hated it). She'll guide me to setting an "intention" and counting my breath in my head (I'm up to '5'-ish before losing focus and having to start back over at '1').
I have some physical limitations and some poses I get super mentally activated on. Still learning which poses I like and which I don't. Mostly I only do floor work but we'll occasionally do some 'harder' stuff like plank, pigeon, or reclined nidra with a cushion slanted up a wall. Problem I'm having is trying to understand/accept that yoga is supposed to be a "support" and not to just white-knuckle through the poses I'm not mentally ready to do yet. If I don't get a migraine, throw up or check-out, it was a good class that day!
I'm pretty bendy & in-shape but that hour each week utterly kicks my butt -- I leave drenched in sweat like I'd run a marathon and pretty much exhausted rest of the day. Too much mind rewiring stuff. The poses I do are extremely basic; it'd probably just look like floor stretching to anyone peeking in. I know most TSY classes are 90 min standard everywhere, but that's personally too much interaction with someone in a closed-in room for me. I'm up to a solid 38 mins of being able to mentally stay with it though, a personal high for me (irritates me she actually times me, but I guess I'm supposed to be proud of the progress).
YMMV obviously but I like my yoga practice. Instructor stays in weekly communication with my T. She gives me homework and I can contact her via email (haven't, but nice to know I can). I know my experience doesn't sound like much, but work with your instructor to make it fit for you.