Does anyone else think they have trouble with forgiveness?

I’ve been enmeshed in feelings of animosity for over a month towards someone who treated me in a way that I did not want to be treated. It’s finally become clear to me that the only way I can be free from constantly ruminating over it (I have to see this person every day) is to forgive. But I don’t know how to forgive, as far as I can tell. I’ve read that it’s an act of will, that it’s impossible to forgive anyone using the same platform (emotions) that are causing angst. Can anyone comment on this? Is forgiveness a theme in your life?

What happens after you forgive? I don’t want to like this person; I think he has a bit of sociopathology going on. Will I “like” him after I forgive him? How can you forgive someone and still protect yourself from them?