Working both sides at the same time?
I'm a very new knitter and I'm about to begin my first significant project--a sweater. I have been reading over the pattern that I'll be using and it all seems to make sense except for one thing--in the neck shaping section, I am instructed as follows:
"Join second ball of yarn...working both sides at the same time with separate balls of yarn, dec 1 st in from each neck edge every other row..."
I'm confused on the 'working both sides at the same time with separate balls of yarn' bit. Does this mean that I just work the two balls of yarn simultaneously as I would if I was knitting with two different yarns at the same time (like for a 2-color scarf)? Or does this mean that I would work one ball with one stitch, then another ball with another stitch? Or does it mean something that I can't even fathom?
I have searched the web and can't seem to find any good explanations for what this means, and I am officially stumped. I would REALLY appreciate any guidance anyone could give me!
Thanks so much!!