Good news want. I think it can be hard to tell so glad you don't know 
miss as with everything pregnancy and baby related everyone's experiences are different. I can tell you my experience/advice if it helps. But it is one of the more personal parenting decisions that you should not feel pressured into feeding one way or another.
I wouldn't bother buying a pump straight away, as it's advised to wait a little while for your supply to settle down before expressing, and that way you can see if you need one or not ( I have the Phillips avent pump and like it but different pumps work well for different people. I like it though as if you have larger nipples 
you can get a different insert for it so that it doesn't rub). You will also have to decide between electric and manual or a combination (I used electric at home and manual when expressing at work as a bit more discrete). You don't have to stick with the same pump as you have the bottles. You can just express into the bottle that comes with the pump (although these are sometimes only 4 oz ones and that sometimes isn't big enough) and you can decant into another sterilised container (either bottle of milk storage bag). Expressed breast milk can be kept in the fridge (check it is the correct temp though) for 5 days. It can be frozen as well but needs to be used within 6 months. Some people like the idea of sharing feeding, but the reality is that you will need to express every time the baby needs a feed to ensure your supply matches the demand which can be even more tiring than just feeding.
Something else to consider if you and your Dh want to share feeding is to look at mix-feeding. Again mixed opinions on it but would allow you to feed but also your Dh to feed formula to give you a break. But it is really a personal decision. My best friend did this as it worked for them, she never breastfed as such but just expressed and used formula as well.
In terms of feeling wary it's perfectly normal to feel that way. It is a huge daunting task that is exhausting but is also very rewarding. But some people have positive experiences others not so. Most advice will say that breastfeeding shouldn't hurt, and if it does then the latch isn't right, but that isn't my experience or those of people I know. It does hurt as your nipples are just not used to having this little person latched on multiple times a day (but should not hurt for more than 10 seconds). So yes your nipples are likely to hurt but nipple cream is an amazing invention and if you are thinking of trying bf then should be included in your hospital bag and put on after every feed whether they feel sore or not. But it does get easier once you get used to it and it does stop hurting. But again it isn't for everyone.
My biggest advice though is to find a local breastfeeding support group and attend before the baby comes, and if you do decide to bf keep going as the support and advice you will get will be invaluable.
I'm sure others will give you good advice as well based on their experience.