The proposed narrative review aims to explore one of the dynamics that shapes the process of professional identity development in psychotherapists. According to the adopted thesis, this dynamic involves a transition from the position of “role–playing” of a psychotherapist toward a position of individualised internalisation of that role. This review synthesises empirical evidence and theoretical contributions regarding the development of psychotherapists’ professional identity. Criteria for selecting the studies were defined, and points of convergence across the authors’ reflections were outlined. The analysis focused on the process of developing a personal, individualised way of fulfilling the professional role. Experiences of the initial stage of being “as if” a psychotherapist (such as imitation of role models and uncertainty) were described, along with subsequent stages of developing a sense of being a psychotherapist authentically and fully, through gaining autonomy, fostering self-trust, and integrating the professional role with personal identity. The model synthesises identity-related experiences and motives across different stages of psychotherapists’ professional development. It highlights a developmental movement aimed at achieving internal professional–personal congruence. It also invites a trans-theoretical dialogue across therapeutic modalities and encourages reflection on the multifaceted process of becoming a psychotherapist.