...and then as I was about to post it, I realized that the people it would be intended for would already know everything in it, because it's part of their nature, and that it wouldn't do anybody else any good.
So maybe there's an even simpler rule here: if you have a fun job, and you're not sure whether or not you should trade up to a less fun job, then you probably shouldn't let anyone talk you into leaving it.
If it's right for you to give up a good job, you'll know it.