I felt the same when I was pregnant with DD. I even had a panic attack one night after I'd been on maternity leave for 2 weeks and realised that I wasn't going back to work the following week but that I had several months off. That was scary in itself for me!

For me I was surprised at how much I actually knew once DD came into the world and how automatically a lot of things happened. I did ring my mum and sister a fair bit in the first month I think, but that was only after trying everything I could think of.

I remember one time when DD was about 2 months old DH asked me about something baby related over the phone while I was out on my own for the first time and I was really surprised at how I just knew and could give him a really in depth answer and fix the problem without even being in the same place as my DD.

I found that instinct just kicked in fairly quickly after having DD.

Don't worry, you don't need to "know" everything, just where to find the information if you don't know. There are plenty of people here who can help with advice. Also, whether you like it or not, there will be plenty of friends, family and strangers who will give you advice...you'll very quickly work out who and what to listen to.