Now the things is that it is so random really, there are some things i manifested and other I didn't and I can't pinpoint the difference of process in each case. All I know from my own experience is that everything that manifested was something that was not strained, when visualization was some sort of daydream recreation rather than trying to implement a new thought pattern in my mind..it was always a natural/innocent daydreaming thing without trying to achieve something through it and I believe that's what books would call detachement. I think when you become self conscious of the whole thing/process, that's when it doesn't work.
I think your own faith can only be built through your own succession of success stories and no one can convince you. There is no harm in visualization, I kind of see it as an outlet that makes you feel good about what you want and the plus thing is that it's working towards getting you what you do want. I used to visualize and daydream about things before knowing about loa and it has never made me feel like I was committing to some sort of lie, it is a natural thing really.