How low does the temp have to be before you reconsider going out? I have a difficult time keeping warm below 10-20 degrees F. I have to dress in so many layers I can't even lift the gun to my shoulder.

Also, like most hunters I get nervous when I hear deer coming. Well, if I'm cold also, I shake like mad. This happened last night and it turned out to be a fawn, but it took me several minutes to stop shaking. (after some silent calisthenics in my tree stand).