Dean Swift’s take on the problem is from On Poetry: A Rhapsody, 1733:
Blot out, correct, insert, refine,
Enlarge, diminish, interline;
Be mindful, when invention fails,
To scratch your head, and bite your nails.
Mine is from a bout of procrastination this afternoon, March 30, 2016:
Re-type, change font, refine, insert,
Enlarge, back up, and then revert;
Be mindful, when invention’s clogged:
Email’s waiting. And the blog.
Oh dear. Busted.