Believe me it wont be easy . . Potty training in the winter is NO fun at all . . no one want to be standing in that cold wet snow. I've been there done that and I know how hard it is on you and the pup. It would help if they had a sweater and a coat and be sure that you stay with them to encourage them and praise them for a job well done. First try getting him use to going poo by taking a piece of the poo and place it on the ground where you want him to go. When he smells their own scent they will want to go. Take him to the same place each time. Eventually he'll figure it out. I think one of the easiest ways to potty train a pup it to teach them to come to YOu. Find out how to do that on my web site.
www.dawnsyorkies.weebly.com/training tips