I love research, and can lose myself in it. Recently, I’ve been working on the details needed for a fake foretune teller in Victorian England. She reads palms and uses tarot cards in her routine for wealthy English ladies. The first mistake I made was in ordering a lovely set of tarot cards. Oops, I didn’t realize that there were period tarot cards and discovered I’d ordered a contemporary deck. So, back to the drawing board–or world wide web.
This is just and example of the problems of writing in a historical time period. None of us wants to use an anachronism. Research is very important. Fortunately, there are wonderful references and experts on writers loops to help.