I had totally flat nipples before children.. and sadly, because of *terrible* nurses and support for the first two dds, I didn't nurse them beyond a few days because I couldn't get it to work
... But with dd3 I was determined (for a myriad of reasons including FINALLY being a SAHM, I didn't want to shell out the $$ for anything else, and gosh, it's waaaay better of course!)... it was a struggle at first, but I had checked into things far more ahead of time (finding a nurse that would help me... there weren't any IBCLCs in the area), gotten books, read online and just generally asking about the experiences of others. .. It was hard for the first few weeks ... ugh.. really hard, even. But.. suddenly things just 'clicked' between dd3 and I and we went on to have a beautiful nursing relationship until she weaned herself at 40 months!
It *can* be done! (just like others said)! good luck on your venture! The most important thing I could tell you is to surround yourself with supportive people!!!