The article analyzes psychological peculiarities of the influence of self-assessment on the success of vocational training. The aspects of psychological peculiarities of the influnce of self-assessment to the educational professional activity have been investigated in the article under consideration. Students of the successful group in the educational activity demonstrate the stability of the indicators of the level. Students in the group of unsuccessful in educational and professional activities, on the contrary, demonstrated indicators characterized by a large spread of their values (there are both unrealistically low and unrealistically overestimated indicators). Students have a well-developed mechanism for goal-setting in their studies. In the unsuccessful group in student learning, the target deviation level is highly inflated. In the process of personality development the determination of professional consiousness takes place.