Affirmations work, because you do them all the time without noticing and they define the way you behave, the "hard" thing is to replace old and negative affirmations with new positive ones, a great tool to use in conjunction with affirmation is EFT, link at my sign, read this article to see how affirmations and EFT work together to make a powerfull impact on your life
Palace of Possibilities - Using EFT to achieve one's potential and good luck!.