I think it's impossible to say. There are so many different ways breastfeeding can go.
Ideal scenario: baby latches easily, no discomfort for you, everything is great and after a month or so you use a pump to express a bit so you can go out or share feeding duties.
Common scenario: breastfeeding is not so easy, it takes a few weeks or even months to establish properly and you're so focused on that, you don't want to even think about the logistics of pumping.
Also common: the baby does not feed readily, your nipples are sore and cracked, you need to do combination feeding or expressed milk top ups to maintain baby's weight as they're not gaining enough weight with direct breastfeeding alone.
Another scenario: you turn out to be a milk champion with superfast let down, your boobs are engorged the whole time and your let down is too much for the baby to handle, you express to relieve the pressure and before feeds to reduce your let down a bit.
DC1 I used a pump as we had to do combination feeding. DC2 latched on much easier and guzzled away and I could never be arsed sterilising anything so he never had a bottle.
Hand expressing can be useful but there's a bit of a knack to it and I think it suits some boobs better than others!
If I were you, I'd just look into what you would buy and then only get one if you need it - note down your nearest physical shop in case you need it faster than internet post allows. I think having bottles to hand in the tough early days of breastfeeding adds extra temptation to switch to formula.
One thing to add is that breastmilk is the best food for babies, but only by a bit. The difference is not that much. It's worth trying but don't feel like it's the end of the world if it doesn't work out. Plenty of threads on here hashing over the pros and cons of both methods of feeding, for me not having to get out of bed and wash anything was a definite pro to breastfeeding! Good luck.