Our guardian angels will be present during the time when our souls will exit this world and abandon the material body. They will be there at the moment to offer us solace and support during that transition and then help us adjust to the realms of the spirits when our soul will be directed toward God. It will be at that point that the soul will become conscious of its eternal condition.
There is no effort that we can make to still ourselves. True stillness comes naturally from moments of solitude where we allow our minds to settle. Just as water seeks its own level, the mind will gravitate toward the holy. Muddy water will become clear if allowed to stand undisturbed, and so too will the mind become clear if it is allowed to be still.