That getting in shape advice is very wise. Buy & break in good insulated boots, invest in a good backpack. The rest of your gear will be fine if you hunt deer in cold weather. There are always lighter cooler items but $$$ sky is the limit there. Binoculars you own will probably work fine but use them spotting at home for practice.
Read what you can, computer scout the areas, arrive early to acclimate to the altitude.
Find yourself a place to practice shooting off of that nice pack or sticks or bipod or knees out to 500 yards. When you hit a big dinner plate consistently you’ll know 300 on the side of the mountain is a piece of cake.
