I hate all that cheer-leading stuff you see on OBEM. I couldn't bear that - I liked quiet and calm when I was giving birth. If I were doing it now, I'd be asking for dimmed lights too. I'm not sure I'd even have a partner there now, and I certainly wouldn't be having my mother, my sister, my friends...ugh. I needed to focus on me and my body, and the last thing I wanted was a room full of people distracting me.
I was subjected to the over-enthusiastic attentions of two (competing) midwives when my 3rd baby was stuck for a few minutes as he emerged. He was 11lbs 3oz and I do remember thinking "this feels funny" but it honestly wasn't that bad - the midwives, I assume, were panicking, pushing in front of each other, each giving me different instructions - and I ignored them. I remember thinking it was none of their business, and a few minutes later my big beautiful boy arrived, despite their conflicting advice.
I didn't use any particular techniques, but kept myself as peaceful as possible, by concentrating on my breathing, and mostly ignoring anyone who came into the room. Birth is about you and your baby, primarily - concentrate on helping your baby arrive in a gentle a fashion as possible. I'm the least assertive of women - or at least, I was back then - but it just felt natural to me to stay within myself.
I know intervention is sometimes necessary, and babies' lives can be dependent on it, but all this purple-faced pushing is just drama. For most women, your body will tell you when and how to push, if you're given peace to listen to it.