Definite goals must be set if you are absolutely committed to getting results. If you failed in the past, it is possible you've been asking the wrong questions. Model someone who habitually is asking empowering questions and clearly knows what they want. Instead of asking why a situation may have set you back, ask how do I attack the challenge and move towards a higher level of commitment. Modeling is an ongoing process to master the skills, techniques, and principals you have acquired from someone you highly respect and admire.
Repetition is the key to unconscious competence or in other words making the skills second nature.
Supplement your modeling effort with various motivational and inspirational books and tapes. The major advantage of modeling is to minimize the time spent learning what is necessary to meet your goals. If you have personal contact with a successful person, don't be afraid to ask questions. Most people like to talk about what they do, especially if they do it well. Some of you may have to swallow their pride.