Let me start with an analogy. Suppose you are from Spain and you fly into Chicago in the United States. As you exit the airport, your goal is to get to Green Bay, Wisconsin. You have no road map and you never have been in the United States before now. Would it be an imposition if someone gave you a road map that leads from Chicago to Green Bay? Certainly, the map-giver knows that there are many different routes you could take to your final destination, but this particular road map is time-tested and gets the person to Green Bay in the shortest time possible. Would this be a service to the person from Spain or an imposition, especially when the map-giver is not insisting on the use of this map?
It is the same with the Process Model of forgiveness. Think of it as your road map to forgiving and it is your choice whether or not to use that map and even whether or not to engage in all of the units of the Process Model. In my own experience, when people want to forgive, many do not know how to do so or to do so in as efficient way as possible. The Process Model is an empirically-verified treatment. In other words, it has been shown in scientific studies to work in aiding people’s forgiving and in reducing emotional distress. It then is the person’s own choice to use it or not, when to use it, and how to use it.
For additional information, see The Four Phases of Forgiveness.