No shit… You start by setting up a protective space so no impostors slip through then you call the entity. I never used enn’s, so I can’t say if they actually summon Goetic demons or just attune you to their current. From what I get, it’s more about the energy. The site founder, E.A., has a universal summoning chant but you can also use Divine names. Chant the Divine names 20-30 times, then call on the servitors:
“Servitors of the name El-Gibor, evoke (spirit’s name) into this room.” Then chant the Divine name again another 20-30 times. Keep cycling through till you feel the spirit’s presence. The longer you chant, the stronger the manifestation.