I really struggled to feed ds, ended up mixed-feeding at two weeks, with mostly bottle. It upset me desperately, and I'm sure was a contributory factor to my ending up with PND. Next time around I managed to breastfeed dd until 23m. It's a matter of suppport and self-belief. Oh, yes, and technique. And did I mention support? The NCT Breastfeeding Helpline was an absolute godsend. I spent many hours crying on their 'shoulders'.
Have long talks now with your dp and anyone else (mum, MIL, HV etc) who you will look to for support, about how you are going to spend your mornings - or even days - in bed or on the sofa, feeding. You will need, at least for a few weeks, someone to help with your ds, any housekeeping etc, while you concentrate on yourself and your baby.
I also prepared by cooking too much food at every meal in the last weeks of pregnancy and freezing portions in foil containers, so that all I had to do was sling a couple in the oven and our lunch was ready - no preparing and no washing-up. Makes a real difference.
And as for boobs, well mine have never changed at all during pregancy. They just get tender and touch-me-not. Then, weeks after the milk has come in (and this happened both times, whether or not I fed exclusively), they zoom up several sizes. Even so, they don't increase as much as others' seem to.