When preparing a scene you should ask questions.
The answers aren’t the point; the point is the ‘asking of the questions’ and getting your mind active. The questions will stimulate your imagination, one of the best fuels to keep your confidence fired.
Any new idea that you conjure while preparing will always be with you. You don’t have to hold on to it. It’s in you.
Work properly so that your practice gives on to good habits. Asking questions is part of proper practice.
Treat your mind with respect and know it is both powerful and delicate. Simply put: be nice to it. Asking questions should be a warm and friendly stroking of your mind, getting its best juices going, getting you going.