Sunset in mid October is around 6.55 pm. Working back from it, a ceremony at about 4.30 pm leaves time for family photographs right after, the wedding party next, and the cocktail hour landing as the light turns warm.
That puts the twenty quiet minutes for the two of you at roughly 6.15 to 6.35 pm, with the last light and blue hour still to come for the reception entrance. Getting ready starts about three hours before the ceremony, so the details and the dress go first while hair and makeup finish.
Your planner will move every one of these times to fit the venue, the travel and the vendors. Start from the sunset and the rest falls into place.