What is the most difficult unit of your 20 forgiveness units?
Research has shown that the initial decision to forgive is the hardest because it includes change and change can be a challenge. By change I mean this: The forgiver now has to start a journey, one that may not be familiar for the one who just made the decision to forgive. Those who decide to forgive know that they are committing to some hard psychological work. The decision, while difficult, involves courage.
For additional information, see The Enright 20 Step Forgiveness Process.