You just start knitting with the second ball of yarn on the side that doesn't have the working yarn attached already. You can snug up the stitches and weave in the ends later. This gives you a strand of yarn for each of the shoulders.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry