Harsh language ahead. Beware!
I have always been sort of a geek. And even before going to my first capoeira class, I read the whole Wikipedia on the subject and came overprepared. I couldn’t do any movement, but I already knew about the traditions, lineages, styles in capoeira. Now I don’t recommend doing it extensively or having any high expectations before doing anything. Do your research, but “empty your cup” for new experiences.