Changing schedule

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I started my sourdough starter three days ago, naively  I did it at 4 pm. Now I get to a point where it needs to be fed every 12 hours and I need to move the schedule to something more convenient. How can I do that?

I would imagine you'd be fine if you did it incrementally. Wait until 5:30 or 6 one evening, then feed it early the next morning whether that be at 6 or 7 or 8, and adjust until you get the rhythm you like. 12 hours is a useful number but exact precision isn't necessary.

Double the food, double the time between feedings, so on and so forth. When you start the cycle doesn't really matter. Enjoy!