I agree 12p is not enough time! I am having my ceremony at 6, and am thinking of starting the make up and hair around 12 or 1 (i only have myself and one or two others getting hair and make up done). But factor in eating lunch, and getting dressed (those dresses and undergarments take some time!), plus putting on accessories. Then extra time just in case you need to fix any part of your hair or make up…I would do 10am just to be safe. If you are having your hair and make up professionally done, it will last through the night!