How do I lead ERP change management with 100+ employees facing resistance?

[Ava68]

I've recently been promoted to a department head role at a manufacturing company, and my first major task is leading a change management initiative to implement a new enterprise resource planning system that will fundamentally alter workflows for over a hundred employees. While the technical rollout is being handled by IT, my challenge is the human side: overcoming deep-seated resistance, managing anxiety about job security, and fostering genuine buy-in for a process that will initially slow everyone down before improving efficiency. For leaders who have steered similar large-scale operational changes, what were your most effective strategies for communication and training during the transition? How did you identify and empower early adopters to influence their peers, and what concrete steps did you take to measure and address morale and resistance throughout the implementation timeline?