Here are some basic tips for dealing with grief:
You will be hit by waves of emotion. Let the emotion happen, and if necessary name the feeling in order to be 'present' for it. Avoid constructing a mental narrative about the feeling, which produces an entirely fabricated layer of secondary feelings, as a way of avoiding the actual feelings themselves.
With everything else, i.e. everything external, keep it simple: change what you can and (ought) and accept what you cannot (and ought not). Very little externally can be changed, and only then with its complicity or if one is acting in accordance with its nature.