I apologize in advance for a long and slightly off-topic post.
Despite what has been said, it is hard to recognize hypothermia in oneself and difficult to recognize it in others. The fact is if one of your group is showing signs of hypothermia others in your group including yourself will have some degree of hypothermia too.
I think it is good to say, however; that if one person in a group is symptomatic of hypothermia then conditions exist that can lead to hypothermia in others and people should be careful to exercise good self management.
My experience with cold injuries/illness comes primarily from more than a dozen years as a full-time mountaineering/climbing guide in Alaska and the the Pacific Northwest during which time I treated people in the field with mild to severe hypothermia. As a side note, I too was taught by my physician advisors not to perform chest compressions on a "cold" patient.