I had recently heard of this 'As-If'' principle and found it very simple but effective.
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As-If principle says that act or behave as-if you have qualities which you wish for but does not posses at present.
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For example, you are not a great speaker but you wish that if you would have been like that person, you would have delivered a good speech. Believe me, you can do it without even having those qualities. You just have to apply As-If principle. Forget that you don't have qualities of your favorite speaker. Simply, behave or act like him. Deliver your speech and see that you have delivered it so wonderfully.
At last, I would like to mention that this principle is applicable everywhere.