I'm really curious about the details of what they think is happening and how it works, for the true believers
is there any commonly accepted school of thought that "all witches know?" or is there lively debate on how their hexes work and their level of efficacy
I assume they never hex anyone with an extremely specific affliction like "your skin will break out in hives" because that's easily disprovable
but if you just curse someone to have bad luck and then they post on social media later "dammit the arby's near me closed down, I loved that shit" does the witch get to be all

"this is how your curse manifested"

do you have to tell someone they are hexed for the hex to work, and then you could argue there's a mental component like if you even subconsciously believe slightly, you could enable bad things to happen to you, or attribute them to the hex yourself

like what do the true believers actually believe can be put to the test with predictable results