Basically, if you think you can, you can, but if you KNOW you can, you WILL.
By setting a goal, having a burning desire to achieve that goal, and daily affirming that goal, there is no way you can fail. You must stay focused on your goal and remain commited to reaching it.
Write your goal(s) down on paper and place them where you can read them every day. Remember, we are staying focused here. Read them out loud to yourself. If you memorize them, read them anyway.
Visualize your goals. Find pictures to represent your goals and put them up where you can see them every day. Can't find a picture? Draw one!
The more you commit yourself to a goal, the easier it is to discover the steps you need to take to reach it. Look at steps that fail as successful learning tools, stepping stones along your chosen path.
Take charge of your life NOW! It's the only one you have.