What if positive feelings toward the one who offended me do not emerge? What then? Do I give it more time?
Please remember that forgiveness is a process and we do not necessarily reach the highest levels of this process. If you do not develop positive feelings toward the person, but the strongly negative emotions shrink to manageable levels, then you definitely are on the pathway of forgiving. Yes, you can continue the process of forgiving with this person, but please know that you are doing well in your forgiving by reducing resentment.