I tried to learn what I could about this and watched every instructional video I could find. Tried it on my SO and she said it was the most relaxed she ever felt. I do think there is an art to it to be learned.
i have a massage guy in frisco, who shares a suite with ladies who provide yoni steams . i know its not the same thing exactly but i thought id throw it out there. also you should look into actual yoni eggs. i can share links if anyone needs some info. lmk if you would like the info. I saw the room they do them in and there's a special throne you sit on and all kinds of stuff. it was super cute and it's not big so there isn't a bunch of traffic.