The journey of growth in this career varies with the specialisation. It also depends on the field of work, like schools, hospitals or business offices. You can start your career with an internship after your graduation or post-graduation. You can also start working directly after graduation. Your experience and skill-set will decide your position.
As a clinical psychotherapist, you can also start your own clinic after a few years of experience. In this case, your growth will be measured by the number of clients you have and the size of your practice.