Play with it! a lot! I had a c/s too, but I didn't get my sling until she was a few weeks old, at which point my incision didn't bother me anymore. I did most of my playing sitting crosslegged on my bed, with her in the sling. I used a ringsling and a hotsling. Just play with the fit and lay, do it when Maddie's not ravenously hungry, so she's not frantic and upset, but is still interested in nursing (maybe after you finish on one side, burp, and put her back on for the other side). I always nursed with her head on the ring side, although I've experiemented with the other side and can make it work, it's just not as easy. For the record, I'm a 40F and they are
not as perky as they were when I had c cups in HS. But really, the absolute best advice is to just play with it and experiment often and frequently, until you are both used to how it goes. It took a long time for me to get used to it and get it right, but we can do it easily now, and we did it at Walmart while christmas shopping. (Which was SO much better than running off to a bathroom or hurrying through shopping so we could get home and feed her.) Just like doing back carries, it just takes a lot of patient practice.