Im talking about this method here Tutorial: Petition Spells Follow the steps as they are because it works and easiest way to petition any being no matter what.
I haven’t used DOM, that book is very complicated. Ironically, it goes against the beginner magick that GOM made its name for; it’s more like tool-free, not beginner-easy magick.
Sigil gazing and opening works the same way as many do here also. Try one of the methods and see GL