Breastfeeding is great if it works.
For now, try not to worry but educate yourself on normal newborn behaviour and breastfeeding.
Find your local breastfeeding support group, searching NCT on Facebook might give details of their group. La leche league might also have something local.
Go along before baby is here, get to know the councillor and the set up. It will help when you try to do it with baby.
Find friends who have had babies and have successfully breastfed who can help you with what is normal and what is to come.
A great book is Your Baby Week by Week. They have a bit each week about breastfeeding and what's normal and why you might want to stop. It's really easy to use as you can focus on the bit the relevant for right now.
Talk to your partner now about what support looks like for you. The main thing is that they understand that they take on ALL household chores. They can help you best by keeping you fed and watered, take baby for cuddles while they sleep and you either sleep or shower, they help you to get comfy on the sofa, and they don't say a word about you spending all day on the sofa with a box set and not doing the washing etc.
Finally, be kind to yourself. The early days of breastfeeding are hard. But it gets easier and it's a wonderful thing to do.