Not an easy task. Time is allocated for the trainer to provide guidance. Specify when and how training will occur. Turf is defined and roles are clear. Expectations are defined for the copy editor's professional growth and development.
Priorities are clear for allocation of time and resources.
Priorities might even change from week to week. Consider that allocating time and creative energy is an art form in itself. Critiquing creativity is necessary, but should be negotiable, and must be defensible.