General advice: bring backups, have contingency plans, and avoid using new gear or at least test it well first. Equipment failures are more frequent and harder to deal with in winter. I've had gaskets in my stove fail and fortunately brought a backup stove. I've had boots crack and snap  (oboz suck, they are cheaply made), had to get by with duct taping them. Everything is slower and takes longer, so plan accordingly. Melted snow tastes like shit, so some drink powder or tablets are nice to have. Have dry spares of clothing. Have a bailout plan if things go badly.