I'll add a couple more skills to the list. Remember I included camping skills in with this list, because DIY elk hunters camp while they are hunting elk.
Using a chain saw and sharpening a chain saw
Splitting wood with maul and axe, replacing axe handle, sharpening the axe.
I thought of the later because I am in the process of replacing an axe handle. After looking at some on-line videos and talking with my son, who has replaced many axe handles, it turns out there is some skill involved in replacing an axe handle and making it ready for use. I am in the process of replacing the axe handle because I broke it, probably through mishandling, as in missing the wood and hitting the handle on the wood, more than once or twice.