Then came the confusion of living in multiple English-speaking countries, where correct spelling differs from place to place. At that point I still figured I was a competent speller, just a bit disoriented as to which correct spelling was appropriate in every case.
Now, the more I edit my dissertation, the less I think I can spell at all. Nearly all of my "crucifixion"s lack an x. All of my "commission"s lack the second s. I somehow never knew there was an "e" in "paraphernalia". Is it timetelling or time-telling? Reworking or re-working? Off the top of my head, I have no idea. Having established that I ought to put "medieval" and "early modern" in lower case letters, I've lost track of whether or not the "Middle Ages" require capitalization - especially if adjacent to an "early modern period".*
I may have misplaced my spelling competency, but at least I still care.
* I've settled most of these dilemmas through judicious use of the OED, the Chicago Manual of Style, and Google-polling.