I didn't have any at the start, tried to express around 8 weeks, I hated it, she hated it, spent the guts of a £100 mothercare voucher we were given on different bottles, a microwave steriliser, etc etc none of which was used. I don't know why I bothered.
Now she's older, (10 months) I've started expressing a bit and it means I can go out in the evenings, by the time I'm back at work she should be ok on water and solids in the day.
Everyone is different, but if you want to breastfeed id genuinely suggest you put aside the money you'd spend on just in case bottles and put it towards an appointment with an ibclc lactation consultant when things start to feel a bit tough.
My baby is sick at the moment and I was thinking last night how grateful I am that it worked out I could breastfeed her as it is a comfort to her, I feel relaxed she's not getting dehydrated, and genuinely it's been really great, but at the start it was v hard, it just passed quite quickly.
If you have to or want to stop there's no issue with that but I feel people tend to say 'it might be hard, make plans to formula feed' instead of 'it might be hard, make plans to get support' - it will be v easy to switch to formula if that's what you decide but it's good to have plans in place for when it gets rough if you want to breastfeed.