My way is just chanting the enn while looking at a sigil for only up to 5 minutes. Then I repeat my request 5-7 times.
What is your way of doing it and what do you think about when you guys invoke demons? Do you listen with music at all? Do you chant certain watchwords or perform a specific ritual before invoking demons?
How quick were the results? Did you notice something immediately or did it take a few days/weeks/months/years? Is 5 minutes enough or should I do more?