Emotions
Understand that your emotions may run the full gamut. Anger, sadness, fear, joy, love are all on the table of grief. The more open you are to them then the smoother your process will be. Humans emote and your emotions can be beneficial. Dismissing them is never helpful.
Acceptance
People die. Situations end. Change happens. These are facts of the Human Condition. The more you accept these life truths, then the smoother your bereavement will go. Resisting and railing against these facts of life will do much more harm than good.
Contain
Containing your emotions is about managing them effectively. You can decide when and how long you will cry, be sad, or reminisce. While these things seem to have a life of their own, you are in control of how they impact you. I recommend that you allow yourself to cry or be sad or reminisce for a period of time when you are safe, e.g. not driving 80mph on the freeway.
Empathy
Be your own best friend. Yeah, you empathize with loved ones going through a tough time. You are patient, understanding, and compassionate with their pain. Your grief process needs you to be that way with yourself. Empathize with your own pain. Allow yourself to be human and empathize with self.