When you become a Christian you will learn how to forgive and it is easy. but if you are not it is hard to.
-- Oh, so close.
When you become a Christian it becomes easIER, not easy.
Yes, there are some sins against you that would have driven you up a wall when you were still in the world, but are easy to forgive when you are a Christian, but your blanket statement does not make it so for all sins.
Yes, all sins can be forgiven, but some require the God's help.
Corrie Ten Boom details an incident where, a couple of years after the end of WWII, she found herself face-to-face with her sadistic, abusive Concentration Camp jailer. She states he didn't ask for forgiveness directly, but commented rather on the fact that we are given a new chance in God.
She states she was feeling strong in her relationship with the Lord, but was shocked at the anger and hurt and near hatred she felt towards the man.
It took every ounce of willpower she had to eventually, after making the man wait for some time, raise her hand to shake his.
She was able to tell the man she forgave him, but states she had to work with God for quite some time to bring the actual forgivenes to pass.
I think she would question your assertation that just because you are a Christian, forgiveness comes "easy."