I guess one time doesn't count as "often" or "tendencies", it's true. ;)

But Kurrent is coming along! It's starting to click, at least for extremely clean handwriting, and I'm hoping to move to more interesting texts this week (with my fingers crossed that dealing with large volumes of less clean handwriting is doable).

Verdict: it depends on the handwriting. If that letter signed "Friedrich Wilhelm II" is actually his handwriting (since he's a monarch, I'm guessing yes)...holy cow, I cannot sight-read it. I can't even guess what it's about. But of the remainder I've tried so far (admittedly not many), I've been able to get most of the words, even if not super fast.