For anyone interested in working with the Angels of Omnipotence, I would highly recommend purchasing Wealth Magick by Damon Brand, the kindle version’s just $10. The sigil they use has a few more bits from the Sixth and Seventh Book of Moses that make contact stronger, as well as the invocations (words of power) taken from the source material.
They describe the ritual itself in some more detail as well, with a few key things added in that make the magick exceptionally more powerful, namely the emotional transmutations that you perform before calling to the angels.
If you are interested in calling upon these mighty beings of infinite power, I would suggest working with them prior to other wealth workings, as they can set-up the really big picture of your life, which the other spirits will then work with. I’d also get some money flowing first with some other beings, partly because that’s more fun (and money magick is all about fun, pleasure, and freedom), but also because the effects of the Omnipotence Transformation, a 33-day working, may take some time to really get going.
You’ll likely notice the ritual taking effect relatively quickly, but remember that these angels are not working to bring you some extra cash. They work to ensure that you are walking a path that leads to wealth, and that can involve some rather large changes. Such changes may manifest as losing a job or other source of income.
Why the hell would you do wealth magick that makes you lose your job? Because your job sucks, and it will never lead you to the wealth that you deserve. Trust in the angels, and know that every apparent disaster brings you freedom, and that the angels will replace what they have taken away with something far, far greater.
Also, because I like you all, here’s a secret for calling upon angels (and also potentially Greek gods, just a hunch, but worth trying I think). After you sing their name, imagine a bolt of blue lightning striking you down from above, infusing you with angelic power, before it returns to the Heavens and the angels.
This technique is useful for any angelic invocation, and as you become more attuned to their energy you will actually feel this lightning rather physically. I sometimes imagine that I am standing atop a mountain or high cliff-face, looking up at a cloudy sky. I call upon the angel, and I see and hear the huge bolt of lightning strike me. I stumble before such magnificent power.