Lifehack.org recommends we: 1. think of the good reasons we are trying to accomplish something (material, emotional, is it a step toward a bigger goal?) 2. make it fun (how can you turn something you avoid into the best part of your day?) 3. take a different approach (mix things up a little, try doing it in a new way) 4. recognize your progress (through a journal, chart, something visual is best) and 5. reward yourself (with something that doesn't conflict with your goal).
I also recommend writing down all the things that you think are holding you back, and taking those one at a time as kind of a goal within a goal. For example, say my goal is to go to bed earlier and get up earlier... a hindrance might be, oh, say... waiting until 11 pm to work on my blog. So maybe I can set an alarm to do my blog at the same time every evening, so that's one less thing holding me back. The less obstacles in our way, the easier it is to stay motivated and finally achieve the things we want to do in life. Why is this important? Because getting off the ground is one thing, staying up is something else entirely.
“Nothing great was ever achieved without enthusiasm.”
- Ralph Waldo Emerson