The example I remember best was that I felt that I was not confident in myself (in many ways). It was very obvious in the way I walked, slouched, and held my head. I knew that the person I wanted to be was confident, and walked with his head held high. So, I began sitting up straight and walking with purpose (and now I actually had purpose). The way people treated me seemed to change almost immediately. People respect you a lot more when you respect yourself.
I've since modified these traits a few times. For instance, I found out about a year ago from a few people that I apparently intimidate people the first time they meet me. Since then, I've decided that the person I want to be is personable, easily approachable, and makes people comfortable. Since then, I've made a conscious effort to always have a smile on my face when in public, as well as to relax my posture a bit to try to put those around me at ease.