Good luck with your changes in 2015! I've also found that focusing on small changes can help quite a bit too when trying to change your habits. Want to lose weight? Try to find an easy way to cut 200 calories, like not putting sugar in your coffee in the morning. Once you have that down, you can move on to another small action. The small successes add up over time and the small wins keep you motivated over time.
Yup. This is exactly how I think everyone should approach new habits.