Changes will inevitably require training. But the adjustment process for people goes beyond skills training. It must include a rather significant reorientation to their jobs, and perhaps a whole new way of thinking about their industry, company and career. This kind of shift in outlook takes time and a great deal of discussion and private processing before a change is fully understood and accepted. This is a necessary step in building commitment to the change.
Process planning for change is thus complex and challenging.
It cannot be taken lightly. Managers often underestimate what it will take to bring the organization from it's Current State to the desired Future State. It is common to misjudge the amount of time, money, effort, communication and planning needed. Similarly, we tend to underestimate significant barriers, and the tools and capability needed to do the job. If you do not pay enough attention to the required capabilities, you can end up in a 'can't get there from here' situation.