The first step is to trim down all my technical jobs so that it's clear that I've been employed, but to only mention the writing-related tasks. Which means I'm deleting a lot of stuff, because any potential employers in my new field don't care about that stuff. Stuff that I spent 13 years doing.
On the bright side, I didn't want to be doing a lot of that stuff at the time and at least I did something about it before another 13 years past.
I realized that very little of my previous work history would count for anything, but still, when I trimmed a 3 page resume down to less than a page, I couldn't help but think, "Wow. I sure have been wasting my life, haven't I?"
Because I was pretty good at that stuff. I got it done. Ridiculously unreasonable deadlines? I was the nerd for the job. I kicked ass, took names, and then deleted it all from my resume because none of it matters anymore.
And I couldn't be happier.