First, just letting yourself know what you want is an act of courage. There are so many easy substitutes out there that can keep you from searching for what you want! These substitutes may seem less scary, guilt-inducing and fraught - but in the end, they are also less satisfying.
Once you know what you want, commit to it. Successful people are ingenious at finding the tools they need to support their goals. These may include visualizing, meditating, writing, talking to mentors, therapy or coaching, reading books and finding people with similar interests. These all help to create an atmosphere of possibility and expansion that encourages success. The most powerful tools, however, are those that include direct involvement of other people.
Finally, don't give up too soon! Be persistent. Stay focused on what you really want. In the end, if you have put in the effort into getting what you want, you may get exactly that. Or you may even end up results that are more interesting than what you thought you wanted!