Many of the personal changes don't have to be huge steps. And some of the bigger steps actually make a lot of common sense to the most people. An important part of changing one's attitude is moving from a focus on quantity of consumption to quality of life. In the old model, the only rational choice you can make about what job to take is to get the highest salary you can possibly get. In the new model, a good salary doesn't hurt, but you also want to look at the quality of your work life.
Money is a means to quality of life.
If you can be more efficient in delivering a higher quality of life for less money, you won't need as much money. A sustainable society would probably have less overall flow of money, and certainly less consumption of resources. What your saying sounds wonderful, if not utopian. After all, some people don't go to the doctor until their tumor grows to the size of a watermelon. There are already cataclysms going on in the world.