The initial stud used to pierce your helix may be too big for your liking, but it is done because it will facilitate healing time. There is some debate about when the best time to downsize it would be, but most people agree that it should be fully healed first; this time varies from person to person and could be as little as three months to as long as nine. If you are ever unsure, the best solution would be to go back to the piercer and ask them for help changing out your piercing for the first time.