Something that was interesting in the Sundin book (Birth Skills) is that she very briefly mentions breathing but basically says that the fact most natural childbirth classes focus so heavily on breathing was because these techniques were developed in the 70s where women were often disallowed from leaving a bed, and were expected to be quiet so that they didn't disturb other labouring women. I think it was a lot more medicalised and process-driven in the US and Australia (Sundin is Australian) than it was in the UK but even here, there were aspects of that - so at the time, breathing was basically the only tool women COULD use to try to stay in control of their own experience and panic etc.
In reality breathing techniques are not enough for the majority of people. They can be helpful in terms of giving you something else to focus on, but it's not going to be enough when you get tired, or have a baby in an awkward position, or have extra pressures like time pressure or have stronger contractions due to induction or whatever. And I don't like books, courses, websites, whatever which state categorically that this is enough and imply that if it isn't, it's because you're not doing it right, or your environment was wrong or whatever. (See also: breastfeeding, gentle parenting). It's way too pervasive and enticing a belief to inexperienced mothers and it's actually just a LIE and I find that really infuriating, actually. It's almost patronising, but worst, it makes people feel that they have failed when really they were just promised something which is usually an anomaly.
I also don't think it helps to think about birth as an experience or something which should be "lovely", I think it helps (at least it helps me) to approach it as something which is going to be challenging, much like a mountain climb, or an exam, or a tricky phase of parenting. If you approach it like that then (IME) you're much more likely to see things like induction, pain relief etc as tools which may help you through in certain circumstances. The same with stamping or vocalising or birth pools or whatever you need to do. Then, yes, you can absolutely come out at the end going OMG, I survived that, I did it, that is amazing - which is a positive experience, but it's not likely to be lovely like a spa day or a holiday or a wedding or whatever. I think that's a misconception, and a misleading one.