As someone who did not get a latch right away and did lots of research afterwards here is what I wish I had done:
The Golden Hour
I missed mine, and this contributed massively to her not being able to feed right away.
Soon as she comes out you want to have her naked on your chest. They crawl up the breast and find the nipple themselves. Let this happen.
We interfere in natural processes too much. Look up the golden hour and go on youtube and just relax and watch a few videos around it.
When baby comes if you feed on demand and co-sleep your milk will be fine as that's how the milk is made, regular suckling and throughout the night during growth spurts, one comes at four months and they need to suckle a lot more and people mistake this for sleep regression, but it's not, it's just the baby needing to suckle to produce the milk that has the right fats and nutrients to support the spurt.
You don't need a thing but breasts and a baby. Go back to nature. Under complicate things. Uncomplicate things.
Golden hour
feeding on demand
co-sleeping
relax and just "feed the baby".
If things go wrong do two things:
try to rectify them
forgive yourself
move on