Antenatal preparation often means that women go into birth feeling more confident and empowered - I know I did and I've spoken to a lot of women who feel similarly.
Birth can be a frightening experience - this "thing" is happening to you and you can't stop it - but if you know what's coming next, you can encourage yourself and you can prepare your birth support partner(s) as to what you would prefer (if there IS a choice - eg with pain relief or management of third stage, etc).
For instance, with DS1, I thought, "Oh, God, I can't can't can't do this, it's just too hard and I want to get out of here and when's it going to stop and nooooooo!" and I felt a real rising panic - and then I remembered, very clearly, that when you thought you really couldn't do it, it was likely you were in transition and the baby would be along pretty soon and that really helped me to relax.
With tearing, I think Mears has talked in the past about "coaching" women to push being a factor that makes you more likely to tear - if you've had discussion around this antenatally, surely that helps you to be aware of that as an issue?
MP, you're not arguing for no antenatal classes, are you?
(And agree, Belinda, really very impressed with the way you've done this webchat - but it's clear that you're passionate about your job, the role of the NCT and the women you're trying to help - you weren't just here to sell fish or plug a foofy book I do wish Davina would STOP the dopey hair ads though - embarrassing and at odds with the work she does with you - would be an amazing statement if she stopped them, eh? Have you mentioned it to her?)