When you reread what your wrote to make sure you haven’t accidentally slipped in something ridiculous/silly/stupid and have yet to fix it.
Sammy: Yo why do you keep rereading that email to Mr. Fass?
Paula: To make sure it’s all good.
Sammy: Ohhh, you got that editor’s paranoia! 💀
One who edits written words without pay. An unpaid editor.
Guest editor is an honorary title issued to anyone willing to edit written copy without pay.