Personnaly it was more comfertable for me to nurse with my right side then with my left, so my right always seems to have more & is bigger then my left because of it. I would always try putting the baby on my left side first - since they suck harder when they first start & then move to the right side about 10-15 min later, unless the baby refused to reattach on that side for some reason.
I think everyone has a side that produces more then the other & that side does seem to ge soar from all the work it is doing. I did try different positions also, sometimes it helps to get milk flowing from different areas of the breast & gives ducts a little break. When I had a blocked duct, my sister told me to put the babies chin when when the duct is (if it on the lower breast, lay in the bed w/ the baby parallel with you) because when the chin is is where the main suction is - it did help to make them feel better.
Also, the position I used for them right side wasn't as comfertable when I held them that way on the left, so I had to find the most comfertable way - so I could relaxe inabling the let down happen more naturaly.
Good luck w/ nursing!!! But most of all congratz on the baby!