I generally have at least one or two other ideas spinning around in the back of my mind (and in several Google docs), so usually-- but not always-- if I get stuck on one thing, I can jump right into the other, and I've generally been lucky enough that some ideas or jokes come loose and I can at least write SOMETHING (just not the thing I was planning to write).
Now, it's a separate matter entirely when there's a deadline involved, because then, if I'm not immediately inspired... I do tend to procrastinate. But generally, as I said, the way I "manage" my procrastination is to start writing something else.
There have been other times when I've just been completely creatively spent, or incredibly exhausted... and when that happens, sometimes it's okay to give yourself permission to take a break for a couple of days. But even when I go on vacation somewhere, I generally find myself gravitating to coffee shops and loading up Google docs...
It's also hard when you've written something you like and then get notes that you don't necessarily disagree with, but also don't necessarily love. Then, you're not writing for yourself, or writing what you think is best, you're writing to please someone else... and if they're not paying you enough money, it's creative agony. (Even if they are paying you enough money, it's still rough, but the point of money is to get you to do things you'd never want to do otherwise.)
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