The 20-step Process Model was not built to be an inflexible, demanding system. Instead, think of it as a road map. On your journey to forgiving, you have the option to stop at 20 different places. Some may be irrelevant to you, or perhaps you already worked through some of the steps. It is just fine to move on to another step. Also, it is fine to go back and revisit some of the more challenging steps as you see a need for more work on that step. So, no, you are not cheating.
For additional information, see How to Forgive.