Your attitude, that is the way you feel about someone or something is typically translated to behaviour.  Very simplistically bad attitude leads to bad behaviour and vice versa.

Being conciously aware of your attitude allows you to exercise control.  Like most emotionally founded behaviours this is usually not easy.

However, the results can be highly rewarding, not just to you but those you interact with as well.  Using your attitude effectively can be a great tool to make friends and influence others (to quote the very insightful Dale Carnegie).

Step One

To take control of your attitude toward anything you must start with recognition that you have one (an attitude).  Is your perception of someone or something fully open minded (without bias)?

The answer is probably never.  Significant bias or percieved feelings about a person or thing constitutes attitude and affects how you act.  Mild bias usually does not.

Recognizing you are displaying attitude is not always easy as it is as natural a personal behaviour as thinking or breathing.  You need to give it some concious thought otherwise you will not even be aware of the message your attitude is sending others.

Attitude is a powerful driver of behaviour and can be used for good.  Unfortunately though, rarely can the power of attitude be harnessed if you are not in control (i.e, your feelings are in charge).

Think of the incredible hulk, when his attitude takes over he becomes big green and powerful but not always in full control of his behaviour.

In the comics we see he fights for control to try and behave in a heroic way, but often his attitude overrides his good intentions. This is very similar to real life.  Success requires some level of control.