It sounds so simple but having a positive attitude and thoughts are the way to make things happen. 

Challenge yourself to spend the next week looking at the positive side of things.  I know you will see the difference.  It may not be drastic at first but there will be a change.  The shift in how you feel will translate into how you act, respond to and manage people and situations.

Anytime a negative thought crosses your mind,  take a moment to not let it affect you.  Immediately replace the negative thought with positive and you will be on your way to success through positive thinking.