Everyone strives to achieve their goals. Some people make them reality and some fail. In the end the only thing that matters is the action of trying. You cannot hit the center of your target with the arrow the first time, you will need to try many times before you make it.
The most important thing when setting goals is not giving up. It is much worse to give up after failures than not trying in the beginning.
Visualization of the result that you want to have really helps you to achieve the goals you have set. But it is only a small fragment prior into achieving our goal.
Always remember that the most important thing is action.