Thanks, all.
Sound advice, chrise: just follow the lieder. I've played a number of the Schubert cycles but never a whole one for recital, just individual songs.
My German tutor was from Nuremberg, so I have a southern accent, though in Germany I've been asked if I'm Swedish. My mother was, so it might have been my appearance, but I rather think that my accent has prompted the question. Doesn't make sense to me.
I once met a family who had emigrated from Germany to Texas, and you can't imagine what their Texas drawl sounded like!