"Relax, you're just making pasta."
I used to be a person with massive anxiety for perfectionism. I never wanted to make a mistake, no matter how small. Thanks mom!
I went with my now-wife to Italy several years ago and we did a cooking class. I was learning to make pasta and trying to make the egg well as perfectly round as possible, and the chef teaching us told me that. Weirdly it struck me as super obvious, and it helped me frame my anxiety in a better light. It helped me figure out my anxiety wasn't realistic, and eventually lead to therapy and medications to help.
Now, I use this phrase at work all the time to remind my teams of software engineers at work that it's alright if something isn't working. We don't work with medical systems or nuclear plants. Bugs won't cause the end of the world, so it's not worth panicking over. We're just making pasta.
I'm GMing Quest for the Frozen Flame currently. It's a super fun AP so far. We're in the last third of the first book.