"So how can you be "disciplined" about your habits? Get the right motivation (See the Top 20- Motivation Hacks for more). Here are a few tips: 1. Pick one habit, and fully commit to it. Don't try to be "disciplined" for a whole lot of things at once. I've tried this (many times) and it always fails." [From: zen habits: Discipline is an illusion; Motivate yourself instead]
I'm reminded of something Colin Powell said in a speech, that instead of trying to motivate your employees, you should inspire them and they would motivate themselves.
I have been guilty of trying to add/modify too many habits at one time -- almost every January. Get up earlier each day, Journal every day, exercise on a regular basis, spiritual time every day, hobby time every day, etc. One habit at a time is a more reasoned (and probably more successful) approach.