Hi Diamond-otherkin!
Medium answer:
I hope i understand your question. Here is my rule of thumb, but make it as real as possible and in a real-life scene just after the thing you want has happened.
There is no right way aside from emotional immersion in a realistically plausible scene. The process should be fun. Like playing a IRL video game in your head. No spiritual grind required. All of NT is only a series of techniques and keeps required worldview and cosmologies to a bare minimum, aside from what I think of as a very casual Folk Hermetic Quantum model for what is maybe going on.
My hot take, using quantum metaphors. You live in a number quantum realities and probably most of them to not include many of fanciful additions people like to add. Don't add them so as to not create yet another a separate reality. And don't talk about what you're doing with anyone , which splits off another you and creates yet another reality. Or something. I think.
Keep it plausible, emotionally and true-to-this world plausible. Close to real life. And example of what did not work for me.
Shakti Gawain in her terrible book has gives a technique where you visualized what you want in a pink balloon floating AWAY from you. So absurd. I am not sure what intellectual reversal could make that work. In NT emotion beats intellect. That said maybe some whose inner-sense-of-meaning is wired the opposite of reality where something moving away from you is actually getting closer, could make it work. But that is not a Law of Assumption technique. In LOA you are to feel-assume what you want is already a ground-truth fact.
Long answer:
I had the same issue with Chaos Magic sigils. For several years, I tried every technique under the sun: the classic letter removal method, scrying sigils, automatic writing sigils— and I never had what I’d call a single success. In contrast, Goetia produced obvious and dramatic results, so that’s been my focus for many years.
If I had found success with the Law of Assumption (LOA) early on, I might never have become a Goetic magician. Goetia can be incredibly dramatic and was probably what I needed to “break materialism,” as I like to say. I spent many years in corporate game development, and in that morality-free zone, you get very good at sorcery very quickly out of survival necessity. That sense of certainty I bring into my New Thought (NT) practice.
Neville’s LOA is incredibly simple. To "manifest" my friend’s dog returning (ugh, these words take a while to get used to), I spent time in a vivid, first-person 3D scene in my mind, watching my friend play with their dog in the front yard, clearly excited to be reunited. I observe them and feel pleased they’re together again, empathetic to the joy and relief my friend feels. I become immersed in the scene and feeling the feeling of these moments. The feeling is said to be important. Neville’s book 'The Feeling Is the Secret' emphasizes this.
For example, say you want a firetruck. In your imagination, spend time with your firetruck. See the red paint and run your hand across the hood. Grip the door handle, feel the cold metal as you open it, then climb into the cabin and sit behind the steering wheel. Notice the sunshine glinting off the hood, see the blue sky, and feel joy in the experience.
Although not required, you can layer on verbal techniques, saying something like, “Wow, I love having a firetruck! I’m so psyched! This is wonderful!” Use your personal emotional language. The specific words are not important in and of themselves.
LOA teaches that it’s important to eliminate any sense of time distance. The firetruck isn’t coming. It's here now. There is nothing to do and taking action that place emphasis not having the firetruck event only reifies you not having it. It’s already here and will appear in your visible world shortly.
You can embellish the visualization with details like glowing effects, runes, the sign of the cross. I sometime say "Fiat est" empathically three times. and then with a gentle hand wave, "And so it" - like it's just so obvious.
These words not magical in an of themselves, but they can make the experience feel more real to you and trigger emotions. But again, it’s already done—there’s no “doing.” A lot of modern magic is too mechanical and intellectual. LOA is touchy-feely.
I also highly recommend getting used to cheesy “normies” in NT space. It's extremely normcore. No paganism, polyamory, and runes to be seen.
In the past 10 years LOA has become very popular outside traditional occult circles, and just like here, there many people are trying to monetize it and get people hooked on the process , or join their little cult. In LOA there are fewer cringe edgelords but plenty of cringe normies.
Many go down a rabbit hole looking for the perfect technique, but stay close to Neville. Mitch too. Not glowing energy needed. That stuff is more Law of Attraction. Neville never talked about energy, or vibes, or staying high on positivity.
About how long does it take? the SATS immersion is usually done over a period of days, maybe weeks. A couple of videos may be helpful (below):
Ignore most of this guy's channel. Like alot of occult influencers he is trying to get you hooked on the process to monetize YT. But his grandfather was a VIP member of Neville’s circle in Los Angles and gives a very good eyewitness account of Neville freely sharing his technique with groups of non-occult normies. Those who "accidentally" manifest climbing a ladder get to comeback come back to his second talk.
Highly recommneded viewing, culture shock cringe aside.
Neville Goddard-My grandfather talking about the VIP Meetings and his testimony creating money.
Neville Goddard - Explaining that what you fall asleep with manifests into your life.
Best to you and yours!
~MB