This is science.
In the higher density dimensions, things are so fluid that you can manifest instantly. I can't wait till I die because that's where the fun begins. I've always wanted to bring down Imperial Starships with the force!
Since this is they physical dimension, energy is dense. It moves much slower than the higher dimensions. This is all you know that's real to you because you've only experienced the physical.
Just remember that it has to come to you, because otherwise it would be against the laws of the univere.
I used this example before. Taking a straw, and blowing bubbles into chocolate milk. It's easy and when you were a little kid it was fun as hell.
You blow air, and instantly the bubbles appear. That's because it's a more fluid substance. It's less dense. That's what it's like in the higher dimensions.
Now if you tried the same thing, blowing air into melted dark chocolate through a straw. It's going to be much harder, simply because it's so dense. That's how the physical dimension is, it's slower to react.
You don't doubt the possibliity of it just because it's not working immedietly.
Give it time
Have faith, because your in control. God or the universe does the work. You control what happens though.
Hope that clears it up a bit at least