Repeat.

Things to remember and ponder:
1. Anything that is reinforced is likely to occur again. (do I say that too often? Good! Remember it! More information on this in earlier posts)
2. Neurons that fire together, wire together. Everytime you think a thought and get a particular reaction...you strengthen that neural connection. You think it, you have a reaction. Think/reaction. Think/reaction. So, pretty soon you don't-even-have-to think-it, and you are doing a behavior. But, in actuality, you did think it. It happened so fast because it is 'wired' together. For example if you had anxiety one day while crossing a bridge and then the next time, you thought..."well, last time I crossed that bridge I had anxiety" which, reminded you and you developed feelings of anxiety again. Then the next time, you do it again... think it, create it. Pretty soon, you don't have to think it, just looking at a bridge gives you that anxious feeling. How many times have you said, "I wasn't thinking anything... I just had this feeling of anxiousness and it was for no reason!" Your thoughts are wired together. The beauty of this is... we have BILLIONS of neurons. Add a new reaction, even in imagination, and you can change your behavior.
Think a thought, see a new & wanted reaction, repeat.