I was never proficient at nursing in any sling when my baby was an infant, but I did learn to nurse her in the wrap when she was older. We always nurse in the tummy-to-tummy carry now, where she ducks her head down and I hold my breast up. Obviously at two weeks your daughter won't be able to duck down like that, but I do know a woman that nursed her newborn baby in that position constantly. She just wore the baby fairly low so there was easy access to the breast.
If your baby likes being held in the cradle position you could also try the newborn wrap cross carry: http://www.ellaroo.com/newborn-wrap-cross.htm If you leave this wrap a little loose in the middle you should be able to position her lower or higher as needed. Then you can do minute adjustments to get things tighter and get her higher by doing shoulder flips with the fabric.
Melanie Magical Mama, joyfully home educating my three wonders: FR (12/02), EG (05/05), DK (06/09)
I've been nursing dd#2 in my wrap carrier since she was about 1 week old. Like MamaToFallon said, I used the newborn wrap cross carry so dd#2's head is right below the nursee. She likes to spit out the nursee at times, so I have to go back in and reposition. Good luck!