I noticed on the film that the ship has a number of modern mechanical aids that will help handling running rigging and spars. Since the ship will not to required to man her batteries, then the numbers of crew are only needed to handling the ship, and even then the speed and precision required during a fleet action won’t be necessary.
Experience will be their biggest deficiency and therefore they will need to steer well clear of danger. Modern navigation, weather, and radar will come in very handy and they are crossing at the best conditions of the year.
Like many Tall Ships of today such as the brig, LADY WASHINGTON, the frigate, HERMIONE, is equipped with an engine to make navigation safer.