no, not if you want to work both sides at once, you could work one side with one ball, then do the other side, but really, you need to attach another ball of yarn. If you only have one ball, then wind some of it into another ball, that way you can continue as the pattern instructs.
If a little dreaming is dangerous, then the cure is not to dream less, but to dream more... to dream all the time! - Proust
currently recruiting for the war i am waging on time, there will be many casualties, but we will be victorious