Forgiveness

I discovered I have to forgive someone. I'm just not sure how, you know? Yah its one thing to say I forgive you...and move on....but how do you MOVE on? How do you take the hurt away and how do you not feel the feelings you have been trapped into feeling over and over? And how do you let it go?? What does that even look like. And what do you do when you say ok I walk away? I lay this down and I turn my back and walk the other way...and then these feelings that you let go rise up again in a month?? How do you do that??
I want to forgive and offer grace and mercy but I just don't know what that action looks like over the long haul.