Don’t make drastic changes. Start slowly, by waking just 15-30 minutes earlier than usual. Get used to this for a few days. Then cut back another 15 minutes. Do this gradually until you get to your goal time.
Allow yourself to sleep earlier. You might be used to staying up late, perhaps watching TV or surfing the Internet. But if you continue this habit, while trying to get up earlier, sooner or later one is going to give. And if it is the early rising that gives, then you will crash and sleep late and have to start over.