it's about 50/50 in terms of "pre-existing knowledge" vs "thing i had to research for a specific line." with that said i tend to double check even things i'm 100% confident about just to be sure, because i'm worried if i get even a single detail wrong someone will barge into my comments section to inform me that they didn't actually eat food in the edo period and everyone just subsisted off the deep sadness they felt living under the tokugawa.