Hi Rosy,
You definately wont know the severity of your baby's feet until s/he is born. That's half the problem I think! We went through the public system which has been amazing - we are following a method of treatment called 'Ponsettt' treatment, which basically avoids surgery. Yes, we had the tenotomy (a minor operation where they cut the achilles tendon), but all of it has been very gentle, and my daughters feet were perfect after 6 weeks of plaster. Her development is right on track with other babies. She went into the boots at almost 4 months old and she was rolling, etc in them. She's now only in the boots at night, so it's all fine. If you like you can give me your email address and I can email you some photos of her in her boots so you get an idea. There also a great support group for clubfeet parents online - i can't remember the address as it's just in my faves page, but if you google Austfoot you'll find it. It's part of Yahoo Groups.
Anyway, please try not to worry about it too much. I know it's hard not to (I was beside myself with worry for about 2 weeks after we found out), but it really will be ok. My daughter is the BEST baby - perfect in every way. When she was born we called her feet her 'fancy feet', and now they're her 'dancing toes'.
You'll be fine,

Amanda