Mentoring
Whatever your status: student, practitioner or advanced practitioner, supervision and mentoring is an essential part of working with real-world clients on a professional basis.
Working with clients is usually more complex and difficult than any of the straightforward examples you tackled in your training and you may not yet have much experience to guide what you are doing and how you are doing it.
Mentoring can help you avoid having to learn everything by your mistakes and give you some encouragement and guidance for the important work that you are doing.
Mentoring is not an extra it is essential
Read In Praise Of Mentoring for more reasons to sign up for mentoring.