How to let go is the key question, and it can be difficult to do. To me, letting go is to not pay attention to something, which means to not reinforce it and to put one's attention elsewhere. Basic learning theory tells us whatever is ignored and not nurtured will dwindle and extinguish. There have been times I have felt anger and wanting to in some way hurt the other, maybe by way of a mean retort or put down, and have let go of that desire by taking my focus away from it and putting my focus elsewhere, which in a short period of time felt good and was the blocked energy released. What helps me let go is recognizing when something I'm feeling is not good for me, knowing that the thought and any subsequent action serves no purpose except to hurt the other and myself, and trusting that putting my attention on a kinder thought will result in my being happier than holding onto what is not good for me.