How to Change a Negative Character Trait

Years ago I read a little psychology book by Don Riso and Russ Hudson about personality types, a topic I geek out on, to be honest. The book talked about the character faults of different personalities, and as I read my own, I became a bit dismayed. I wondered how I could change negative characteristics that seemed to be interwoven in my DNA. How would I change who I seemed to be in my core.

There are spiritual answers to this question, of course, but I am talking about something more...