If you've had trouble with v-necks and are disappointed and wondering what you did wrong, you don't have to look further than this tutorial.  We take you step by step through a process of sewing a neck facing to a v-neckline.  Your example may look slightly different than mine, but you should get a general idea on how to get a nice looking v-neck with no bunching and puckering.  Even if you're adding a lining instead of facing, you can still apply these same concepts.  Definitely watch this demonstration before attempting your next v-neckline.