Leave them alone, enjoy the last flowers which may go on for another month. The first hard frost will kill all the leaves, leave all the old growth on, it will die out and then at the end of February cut it down to ground level and the new growth will start for next year.

if they are in pots then bring them into an unheated but brightly lit area and reduce the watering. when all the leaves have dropped keep them barely damp. then when new growth starts in spring prune out any dead wood as Drbob suggests.