Case teaching requires a big commitment of time, particularly for a beginner. A beginning teacher can easily spend 10 hours preparing to lead a single ninety-minute case discussion. If your class meets twice a week, that means 23 hours of preparation and teaching. Add time for evaluating comments after class and marking assignments and the total will reach 25-30 hours a week. When you teach the same case in a subsequent semester, preparation time will fall by 50% or more.
Case teaching requires a commitment to put your students first. You are promising to teach and mentor them. The stakes are high when young people trust you to guide them. Teachers at Acton promise their students: "Apart from my own family, nothing comes ahead of you this semester." You might meet this commitment with regular office house or a promise of prompt responses to phone or email requests. Budget time for connecting with students, and let them know what to expect.
And, of course, case teaching requires the commitment to wade into discomfort for the sake of growth, to try new things in a field where you have been an expert (and where you want to look good.) Competency develops outside your comfort zone. Progress often feels (and looks) awkward.