Have a great trip! A tip for cold weather camping- no matter what your sleeping bag is rated, it will not keep you warm until the inside is warmed up. I usually take a short walk or even do calisthentics before hopping into the bag so that my body at least starts out warm. A nice hot drink or hot dinner really helps too. Do not stand around too much at night and get really chilled before bedtime.

And, if you put on too many clothes when you first get in the sleeping bag, the bag never warms up properly. I have had the best luck by hopping in with just my base layers (after excercising so that I am also warm) to get the bag warmed. I too put cloths inside the bag at the foot and later if it gets colder, I put on more.

Also, keep the head and neck warm. Take a second hat- a 3 oz balaclava works well.