It is definitely not too late. If he won't latch on at all because he needs a little enticing, you can get a dropper, put some breast milk on your nipple, and then let a few drops out every once in a while to keep him going. Once he gets the idea that sucking for a while will get the milk to come, he will probably latch on and nurse like a pro. You could also pump first and once you have let down, stick him on. He may need to eat more often for a while, just feed on demand, it will level out once your breasts are used to nursing.
I will say that it could hurt for a while, but it will go away. It took maybe 3 weeks for the pain to subside for me, after 2 weeks I noticed it was a lot better. I actually relactated, so I had to go through it twice. It was definitely worth it. Get some of the cold gel pads to put on your nipples after nursing, or you can just try doing ice afterwards. Use ibuprofen to help with the pain, and try to keep clothing/bras off of your nipples while they are trying to heal. I used breast shields in my bra, or went around topless. Good luck!