I begin each day by selecting some action-oriented goals which I hope will advance some broader achievement-oriented goal. For example, if I'm working towards an in-classroom prototype around a set of ideas, I might aim to spend three focused hours fleshing those ideas out in sketches.
This is a natural spot for brief deliberation, but once the day begins, I focus on the actions I've chosen and suppress planning. The rest of the day's work becomes roughly deontological. I give myself permission to be satisfied with the day if I spent three focused hours sketching like I'd planned.