Agree with pp it doesn't sound like you are ready op or that you want children. Do you see children in your future? Like others said all of the stuff you mention is only for a short time. But some thoughts on what you asked:
Money - budgeting! Working out how much it will cost in childcare, how much needed for nappies, food, clothes. If you can cut down on other things it helps so there is flex to pay for the baby stuff. Like buyin cheaper food, less branded products, less clothes for yourself. Obviously it depends how much money you have and your lifestyle. If you go out a lot you may not as much with a child. If you spend a lot of money on holidays you could save there. That's all a personal decision based on your circumstances though.
Energy - you just do what you gotta do. Before DS I was terrible getting up in the mornings. But when you have a child you have to cos it's not about you. And as much as you want to you just can't go back to sleep as they will wake you up if you try! But you love them so you don't mind as much as you think you will because they need you.
Labour - well you generally have 8 months notice to prepare. Relaxation, yoga, hupnobirthing if you fancy it. In my experience it was yoga, relaxation and knowledge that helped me. The more I knew the more in control I felt. And the yoga breathing was what really got me through it. But in perspective - labour is only a day or less or a bit more out of your whole life! And of your whole child's life!
Breastfeeding - I breastfed til 13 months when DS decided to stop. Was difficult to begin with but it's like any new skill. Practice makes perfect. You can expect to be an expert the first time you do it. It's like learning to dance - you watch the DVD and know the moves. But then you have to dance with someone who also hasn't danced before and hasn't watched the DVD! You both have to learn how to do it for the first time and how to do it together. It takes perserverance. But then it's not for everyone, formula is an option if you choose not to breastfeed and plenty of women choose not to or do a mixture of both.
But sounds like you need to think about whether you want children to start with - the detail comes later once you have made that decision.