It depends on the world's mechanics I think. F-Frederic was able to learn and I suspect that's because his world had magic and the like. However I allowed someone from a world with no supernatural happenings at all to try it and it only worked after I finished the sigil myself. Meaning I drew out the last, main, symbol in the middle.

[ He taps his chin on his end. ] I believe it's able to be learned if those two cases are anything to go by.