Questions about Step 3

I haven't exactly started step 3 officially - I want to re-read the information on it. And ask a question. Is part of that step having meals at the same time each day? And, if so, how much leeway is there? What if I KNOW dinner is to be at 7:30 PM instead of my usual 6PM, for example.
Also, the time of getting up in the morning depends on what is scheduled for that day - could be anywhere from 5 to 7 AM, occasionally later. What do people do about that kind of a situation?

Marcy