We went to NCT classes over a period of about 6 weeks. There was a lot of emphasis on the birth (hence the name National Childbirth Trust, I suppose ) but they also covered some baby care and encouraged us to think about how the baby would affect our lives, hobbies, free time. That was the only preparation I got for for full on a small baby could be, and it was invaluable.
I too was nervous about birth, but the more I learned the stronger and less vulnerable I felt. I found reading Ina May Gaskins guide to childbirth very helpful in the last few weeks. Quite hippy, but full of pages and pages of positive birth stories at the front.
If you are scared about labour etc, I would actually say there is all the more reason to go to antenatal classes. A lot of it I did already know, but my partner was clueless and it really helped him, and made him a better birth partner. Plus you can ask questions, share your concerns with the other mums and so on. I didn't really make any friends via the NCT, but I do live in a rural area and we're all quite scattered. The friendship thing can be a big part of why people go, however.
We went to about 6 classes, once a week. My teacher phoned me after the birth so I could talk about it with her - VERY helpful - and we had a reunion a few months later which was fun. I would recommend it if it's your first baby. We only paid £80 due to a low income, and they have a sliding scale.
Anyway, congratulations! I hope you find the info on this thread useful