Applied training of pre-practicum, practicum, and internship are important gateway experiences for rehabilitation counselors-in-training. Counselor educators and supervisors must be aware of requirements and expectations of counselor-in-training supervision and common ethical issues specific to these clinical experiences of rehabilitation counselors-in-training and their supervisors/faculty. The authors identify and discuss the CORE standards for practicum and internship in the preparation of rehabilitation counselors. Information is presented on the preparation phase, mandatory aspects of fieldwork and implications for curriculum standards, as well as supervision, and ethical and legal issues.