I think computer gamers would be the survival gurus after an event like that :) Most of us play post apocolyps or survival games where you spend the first gazillion hours establishing a method of survival. Ark Evolved, Rust, Empyrium, hell even minecraft to an extent. I have probably 300+ hours in Empyrion, possibly 1000, in mincraft, hundreds in others.
It would be second nature for games faced with the real thing to establish Water first, food, hunt for seeds ore replenishment food. Shelter, weapons defense. While the loonies are raiding wall mart for the last can of baked beans, we would have a base of survival set up by the time they even worked out they needed one.
You would need lots of diverse skills to have a chance of surviving.
Some think you could just grab some guns and take what you want. I guess that would work too, for a while at least. But sooner of later they are going to run out of things. You watch movies like mad max and see them roar across the waste lands raping and pillaging. What are they eating? What are they drinking, where is all this fuel coming from.
Nope, if we get sent back to the stone age by some apocalyptic event, when I decided who to let in to my group, i am going to make sure I have a gamer of two in there.