Well, that's done, at least for now

I suspect I'll always feel that moment of anxiety immediately after clicking the "submit" button when submitting a manuscript for publication.

I think the last time I tried submitting to this particular journal, the submission quickly bounced back because it was estimated to be too long for publication. We have tried to get this one sufficiently under length, but of course I have my doubts. And if it's a desk-reject it will also bounce back quickly.

Best to move on to other projects in the meantime.