I actually grew up as a farm kid, so if TSHTF, I'd be able to go right back to what I did as a kid growing up. But I could also be useful as a handyman, since being a farmer required you to be a jack of all trades in order to keep things running and also build things you needed around the farm. In the end I got quite good at building and repairing things, so I know that skill would be worth something.
Another thing I got good at was building and repairing without the availability of a welder. So I can screw, bolt, and glue together just about anything and make it better than new in some cases.
As for the memory problems that GMW mentioned, a simple pattern system of memorization will do the job to get over that. As for those who chronicle and record history, a strong attention to detail and accuracy of events would be highly important. That's what made being a scribe in the old days such a lucrative career. With limited literacy, anyone who could write and do it well always had work. I think in the end you'd see a lot of secretaries with dictation skills initially fill the job of scribes as they'd already have all the needed skills ready to go. Who would come after them though is anybody's guess.