I have a short torso, so nursing pillows weren't helpful for me. My lap is the pillow.
Really big boobs mean that the baby's head might rest on your wrist instead of the crook of your arm. Don't worry, the numbness eventually goes away.
Rolled up prefolds/washcloths under the breast help with support while nursing. Bonus--they soak up boobsweat and milk drips. I tried one of the udder wedge support/pillow things, but preferred rolled cloth.
Sidelying was a godsend.
Time. Eventually your baby isn't quite so small and can help wrangle your giant boobs. Really.
It's tempting to try to control your baby if you have unruly breasts. Watch your positioning. I didn't realize I kept touching my son's head (top of it) while bringing him to breast. So he kept reflexively arching away, which upset him quite a bit. Once I realized I was triggering that reflex (it's a birthing reflex for them), I stopped touching his head or letting it touch the armrest of the couch and he was much happier.