When you begin to do the work of forgiveness, you should realize that you are practicing a moral virtue. As Aristotle reminded us 2,350 years ago, to grow in any moral virtue takes effort and is a struggle. So, please be prepared for some hard work as you proceed.
At the same time, it is important that you not drive at this without rest. Suppose you are starting an exercise program. You would not want to put such effort into this that you are spending 8 hours a day, neglecting other aspects of your life.
What you need is balance (or the virtue of temperance). Yes, work at forgiving and give it your attention, time, and energy. And yes, rest and refresh. This latter point is too little emphasized in high-achievement cultures.
Try to enjoy the journey and please do so in such a way that the forgiveness journey itself does not exhaust you, but instead eventually refreshes you.