Sit in meditation, but do not think. Look only at your mind. You will see thoughts coming into it. Before they can enter, throw these away from your mind until your mind is capable of entire silence.
"Perfect love casts out fear." It is not be thinking ourselve sright that we cease to fear. It is simply by loving, and abandoning ourselves to the One whom we love without returning to self. That is what makes death sweet and precious. When we are dead to ourselves, the death of the body is only the consummation of the work of grace.