It seems to me that if you allow doubt into a working, that’s like opening up the possibility of a binary outcome, a “win” outcome where reality bends to your will, and a “lose” outcome, which is usually the thing that probability would have caused to happen anyway.
Say you need $200, and you do some work for it to come to you - the Win would be for example, someone hires you to do something you can easily do, and you get the money, or you win it off a scratchcard, or find something you can sell, whatever - the Lose outcome is for reality to go on like it did before, and you still need that cash.
If your mind holds any doubt at all (doubt is the flipside of attachment - you’re attached to this outcome, which implies the opposite outcome can exist) then reality, like a river being dammed up, is just going to choose the course of least resistance, and your magick won’t work because it required a change to occur.
I have no idea if that imagery makes sense but this is how it’s seeming to me, and I found my concept helpful because 1. it stopped this issue of “attachment” from being in the realms of almost the moral, philosophical, religious-like stuff, and 2. it’s helping me construct a model of how our minds can control reality by staying focused on not imagining the outcomes we don’t want.
And don’t forget, you already ARE a living god, so you might also want to consider why you’re choosing to experience this difficulty, at this point in time? It’s a more empowering way of looking at real problems that are there, I recommend the website of a guy called David neagle for more of that type of thought, he’s got pages of Q&A format things where he coaches people to look at their problems as a thing they’ve created for a reason in their own lives.