1) I second or third the advice of taping your escape bearing to your compass. Will add to attach it with a lanyard to the zipper pull of an outer pocket of your parka, or around your neck under your parka for easy access in a gale.
2) Use overmitts with "idiot cords" that attach to your wrist, to keep from sailing away. Have the mitts fit so you can wear light gloves under the mitts. Mitts come off for detailed work and pop right back on (you don't even have to put them down thanks to the cords).
3) Keep the googles stashed in an outer pocket or top pack pocket until you turn into the wind. No need to risk fouling them with frost until you really needed them. Related, googles and facemask must work together as a system. Idealy, you should be able to exhale through your mouth and not fog your googles but this rare. Windproof face mask is a must, imo, but the windproofness will work against your googles. Googles should be double paned, btw. And never put them up on your forehead like Jean Claude Killy. They'll frost for sure there.
4) Stay hydrated and keep water handy. Insulated bottle holders are ok. Another approach is to put small waterbottles in the inner pockets of your pocket. I would avoid hydration systems with tubes, which can freeze. Lack of hydration can lead to fostbite. Speaking of food, precut and everything and avoid foods with water (dried fruit, Power Bars) or greese (salami) which can freeze. Of the 2, take greese, not waterbased foods and store in your parka's inner pocket. Otherwise, I carry 3 feedbags: a) sweet fatty carbs (Shortbread cookies and such), b) salty whole grain carbs (crackers and such), c) peanuts and m&ms (but no raisens for extreme cold).
5) Hike within yourself. Find a pace you can keep at the entire time above treeline. Avoid going fast (sweating) and sitting (freezing your butt off). Motion is heat. Ideally, you are dressed just right so you can hike at the pace while venting with your parka hood and front zip. Be sure to have fat zipper pulls that you can work with your mitts on attached to all jacket zippers. If you can afford them, this is also where side zip pants rule. Tip: Undo the top of the zips BEFORE you put on your packs hip belt. This ensures that the bulky zipper pull is not under your hip belt and allows you to more easily adjust the side zips for ventilation.