Don’t use those. How these were actually used is unknown but it’s the same as what Maxine said about the Sanskrit mantras. It’s impossible with methods we know to get all of the residual of the energy off of you the Necromicon is really powerful this ties you into the curse as well. So you go down with whoever or whatever you did the curse against. In fact this may be worse cause you are actually staring at a sigil for all I know.
If you did it your probably only bet is to ask your guardian for help or how to counter it. If you didn’t don’t do it.