I do know how you feel, I was like that too. Things like changing nappies, washing etc, you can ask the midwife. When you have a baby there are nurses that you can ask for demonstrations (always a good idea with the first nappy!). Small hospitals seem to be better as everyone has more time. If and when you get pregnant you should get "The Pregnancy Book" and later the "Birth to Five" book which give you all the basics and are very helpful.
As for actually mothering, as long as you're a relatively normal person you'll be fine. A strange thing happens when you're pregnant in that you slowly become a mother. I know this sounds daft, but it does change you in a profound way. This is NOT as scary as it may sound. You just go from thinking that you'll go back to work full time, maybe part time if you can afford it, to being unable to imagine being away from your little bundle, for example. It's not easy and the more support you can get the better, but you will find a way to cope, because what else are you going to do? Like someone else has already said, if you're thinking about this now then you will be fine.