Get there by no later than Thursday. Friday is going to be ugly, and early Saturday the worst of it. Be ready to not have power or be able to go anywhere for at least 24 hours if it hits hard. If they tell you to leave, do so immediately. Just be ready to rely on yourself and those around you. Kinda like a pandemic, but with wind and lots of water.
Update: looks like it's going to be an earlier arrival than we thought, with Friday afternoon as landfall for the storm.