The starting place is to realize that Jesus Christ died for your sins and met you where you were. His example is the best pattern we can possibly follow. Once you have placed your faith in Jesus Christ, it is important to thank God for His amazing unconditional love and forgiveness. Then take a step of action to forgive those who have offended you. Forgiveness is a private decision of the heart to let go and place the offender and the offenses in God's hands.
All human beings make mistakes and hurt one another.
Working through forgiveness is crucial, even when it is painful. When we choose not to forgive, we allow another person or circumstance to control our lives. Once you open your heart to forgive the offender, God can help you have a change of heart toward that individual. Choosing to forgive diminishes the anger in the heart. Unforgiveness, or the refusal to forgive, can result in acid-like resentment which is destructive.