I have large breasts. It really helped me to position my baby lower down toward my waist than I thought I needed to. If he came to latch from beneath my breast, his nose was never smooshed. Also, it helped while we were learning to experiment with different tweaks to the position. You could try angling your bodies, so that you make a V shape, if your breasts are large and her nose is in trouble.
We ended up being most comfy with DS's head on my biceps with my arm sort of halfway down to my side and wrapped around him, that way my arm also supports the side of my breast somewhat.
Just keep practicing, and know side lying nursing is truly an art form (well, it was to me anyway). Now that he's more mobile, I just roll over and he nuzzles right in...it gets a lot easier. That website that GoGoGirl posted is really good!