Manifesting is struggling, life is effortless
You may or may not get what you want by "manifesting", and I'll explain to you why.
If you've been practicing for a while, you already know sometimes you get the things you want and sometimes you do not. Each time you do, though, it happens effortlessly. Almost aggravatingly so, since the times you do succeed with — you barely even try.
Your ego, depending on a lot of circumstances, conditions, thought patterns - may or may not believe it can manifest. Because, basically, before the concept was introduced to you - you never did it before. It is like studying for a test, you know this is the material you have to learn, you do so thoroughly, you settle it into your memory perfectly, and yet you can never be sure what the test may present you with. You may even have a lot of confidence in your knowledge and think you've got this under your thumb, but what's put on the test you still can't control. Likewise, you've learned how to manifest perfectly, you know all the methods/possibilities/techniques which you can use and you use them - however, the results are always shaky. So who decides what materializes and what not?
The one that's materializing the ego thinking and doing stuff right now.
The one thing you already have a lot of experience in, the one you do effortlessly and inescapably by existing is being. You've been something all your life, you can't say you don't know how to do that, because—you're being someone reading this post now.
Imagine if you knew yourself as who you really are, the way you materialize this body and this world live and instantly, the same way you'd be able to materialize a different one whenever. The test, the event, would now be put there by you. The confidence you thought yourself into before would now be replaced by a sureness, almost laughable inevitability, one you didn't attain but have. Circumstances you now leave to a "3D conforming" (the ego-body-mind, are circumstances too, btw) exist when you want to.
You don't want to "manifest", all you want is to be your self.
But to have it, you have to go beyond the mind, and to do that - you let go of all the things you think yourself to be, not add more labels on top of it like "God", "Master Manifestor", etc.
Those might satisfy your mind for a bit, but they won't stop you from being what you know yourself to be. To know yourself as the source of all that is you have to first remove the veil of what's stopping you from seeing it in the first place. The labels you may add, but do 'you' know how to operate as any? The only thing you know from experience how to operate is "I AM".
The process is one of letting go more and more until you find yourself having nothing, being nothing. The thing about nothing though is that it's the only thing that can take the shape of everything.