For propagating plants in the winter hardwood cuttings are the best way to go. I find that propagating through hardwood cuttings is much easier and more carefree than taking cuttings during the growing season.
When taking hardwood cutting I use first year growth that is around 6 to 8 inches in length. The cuttings should be about a pencil thickness if possible but that isn't a hard and fast rule. I do use rooting hormone on the cuttings to help them along.
The procedure is the same for all sorts of plants so you can use this video as a general guide on how to propagate hardwood cuttings. In the video I did viburnum, peach, plum, and crape myrtle cuttings. I took about 30 total cuttings and later this spring we will get to see the results!