Is there really only one surefire way to manifest? Some people will have you believe that there is. But I believe that there are many routes to the same result and that we must find the path that resonates with each of us the most.
I have read and heard about many theories on the "best" methods to use to manifest results, and I have tried several of them out too. What I found was that unless the method made sense to me, and unless I could really get into it, it didn't do all that much to further my progress.
Each of us is unique. Consequently, while something may work well for many people collectively, if it doesn't work for you, there is no reason to get discouraged or think that there is something wrong with you for not getting it. Instead, you must realize that what will work for you best is what you can believe in the most.
I'll give you an example. For a long time I had a hard time reciting affirmations while looking into a mirror. I felt ridiculous and distracted and so it was no wonder that it didn't really work for me. I knew others who swore by it, but it simply did not resonate with me at the time. Now, the reason it didn't work for me then was not because this method was necessarily wrong but, rather, it felt "wrong" to me. So I chose other methods that did resonate, and the results I received were a whole different ballgame.
Here's the real truth. There is not only one method for manifesting that works. There are many. So try some on for size, give them some time, but feel free to adjust them or just move on if they don't resonate with you personally. You have not failed. You are simply learning how to trust your own instincts. And know too that your opinions and methods might change as you evolve your consciousness. And when that happens, trust yourself to find what works for you at that time as well.
In my opinion, there are no rules but one in the manifesting game: You must believe in what you are doing in order for it to have the most and best impact for you in your own life. That's because belief causes you to feel more open to possibilities and it defuses your resistance so that your method for manifesting has the ability to actually work for you. Therefore, if it resonates, do it. But if it doesn't, either adjust it (or your belief), or just move on to something else. You will find your way. Just be easy with yourself in the process.