If you have decided that you need to change yourself to get to where you want to become, prepare yourself. Know that it is not something that you can do half-heartedly or occasionally or worst, when you feel like it. Changing yourself is more akin to a full time job. Calling in sick or taking leave will hinder your progress and momentum. You would need to be persistent and diligent in your efforts to effect the necessary changes in your life. It would be best if you are clear in your intentions of doing so. That it is coming from you and no one else. That you would give yourself as many chances as needed to get back to the pursuit of it when faced with setbacks. And always remember, have patience.