For me, at least, rationalizations and planning don't work when it comes to forming new habits. I just have to jump into it. With sleeping, I set my alarm clock at 4:30 and got up. First couple of days were tough, but eventually my internal clock shifted.
Having said that, you should have a good reason for waking up early aside from "I want to be one of those guys that get up super early; they seem to do so much work before I even open my eyes." For me, it was a couple of reasons:
- doing my morning power walk before all the traffic (so I can put in my earbuds and crank up the noise)
- getting stuff done before everyone else wakes up and messages/emails/calls... start
- prepping most of my food for the day so that I save more time
- avoiding evenings when I have to do a lot of work so I can focus more on reading/learning
It also helps if you're tough on yourself. I know I won't achieve what I want by irregular sleeping schedule and spoiling myself. And if there is ever a late night I still get up at the same time; I just take a caffeine pill later in the day.