PP have covered it all pretty well. It can take a good few days of pretty much constant feeding to get your milk in. Once it's there, you'll know!
I find an electric pump easiest, although neither of my kids have been great with a bottle. My DD never took a bottle, but from a few months was happy with a cup or just didn't bother.
I wanted to answer the brutal question. No lie, bf can be painful, but if it is, there's a reason. DD hurt, struggled through and later discovered a lip tie, which could've been easily resolved if I'd known what to look for and been proactive to ask. DS was a breeze, never a moments pain.
It is brutal from the perspective of the commitment in the early days. Cluster feeding to get your milk in, especially the 2nd / 3rd night can make you feel you'll never sleep again. But it passes. And after a few weeks, when it's settled, where you never have to get out of bed to make a feed, prepare a load of faff to go out, or sterilise anything, it all seems very worth it!