Send people out or teach them yourself. Teach - pig skills and people skills. Provide tools and processes for employees to use - that reinforce use on the job. Stressful - universally felt. Resistance is normal - predictable.
People resist being changed.
Know that responding productively to change is a process. Move people from resistance to cooperation. Focus on those who will change. Understand that responding productively to change is a process. Unresolved conflicts in the workplace are costly and sap energy better used elsewhere.