As a rule: before the wedding the groom should be shaved or anyway, if he has a mustache, beard or goatee, it must be well groomed. He should visit a professional for this unless he has the knowledge to do it himself. In any case, it is preferable to visit specialists for a certain outcome. The barber knows how to prepare your skin, what materials to use to soften the beard, how to use the razor, and what cream to use.
Let’s not overlook the fact that when a man has a shadow (three day beard), this shows more attractive and appealing in most cases.