Just Starting & help changing neckline

Hi all---I am just starting this sweater and found this knitalong! I've enjoyed seeing all of the other sweaters out there--they look great! When I get there, I would like to change the neckline a bit to make my sweater a bit narrower and snug in the shoulder line. I noticed that a couple people changed the neckline a bit, too. What did you do? If anyone has recommendations I'd love to hear them! Thanks...