The Freakonomics Guys say expert performers - whether in memory or surgery, ballet or computer programming - are nearly always made, not born. And yes, practice does make perfect.
Librarianship is certainly a profession where practice does make perfect, no one is born knowing what reference books are in ready reference. I don't care if you think you're the best librarian in the world, I'm curious about what else you're good at. Can you juggle chain saws, or create world class ice sculptures, or maybe you're an expert marksmen. Is this talent something you had to work at, or are you a natural? Can you ride a unicycle on a tight rope? Your talent need not be so ridiculous, I'm just thinking of amusing and impressive skills that might get you hired at Disney World.
I have but one useless, not very amusing, and apparently natural talent, I can almost always remember where I've been, and find my way back. As long as I can remember I've been amazingly good at not getting lost. I can still remember my way around places I've only been once, and haven't been back in years. The only thing that "sticks" in my head with no effort are these maps I build of where I've been.
Everything else I have some degree of proficiency at (Seems to be computer related mostly) I've had to work really hard for years. Plus everything else is really useful and rather mundane. But the ability to remember where the mall is in St. George Utah is just a stupid human trick.