This chapter describes the Train-the-Trainers (TTT) process along with the implemen‐tation of the HAND in HAND: Empowering Teacher Across Europe to Deal with Social,Emotional and Diversity Awareness Career Challenges (“HAND:ET”) programme infive different countries from the perspective of trainers. Before HAND:ET was imple‐mented in the field trials, all trainers participated in TTT preparations consisting of a full 6 days of training and an 8-week online course in Mindfulness Based Stress Reduction (“MBSR”). The field trial consisted of 6 days with teachers and other school staff on-site and 5 online meetings. Throughout the implementation, the trainers were given supervision as a way of supporting them in the process. The TTT process followed the methodology of mindfulness-based intervention teaching assessment criteria (“MBI:TAC”). To follow the progress and stay informed about difficulties in the field, the trainers completed a trainer questionnaire after each session. The results show that they were prepared, flexible and had succeeded in creating a supportive and adaptable training environment that addresses teachers’ unique needs and challenges. Despite some challenges and varying opportunities for teachers in the different coun‐tries to participate, nearly all of the sessions worked well or very well according to the trainers. The work atmosphere was reported to be good or very good at almost every session. It is concluded that the trainers in the HAND:ET project were well prepared both theoretically and practically, with this constituting an important reason for the implementation’s success.