The devotion is practiced by praying the Divine Mercy Chaplet and Novena to the Divine Mercy, both of which may be prayed at any time, but especially at "The Hour of Great Mercy" — 3:00 PM, the hour our Lord died, and in conjunction with Divine Mercy Sunday.

On Divine Mercy Sunday, a plenary indulgence may be gained, under the usual conditions, if one

a) trusts in the Divine Mercy and reflects the Divine Mercy in his life

b) prays the Divine Mercy Novena from Good Friday to Divine Mercy Sunday

c) goes to Confession on Divine Mercy Sunday (or in the 7 days preceding)

d) venerates the image of the Divine Mercy on Divine Mercy Sunday

e) attends Mass and receives Communion on Divine Mercy Sunday

f)  is free from all attachment to sin, even a venial sin

This last is most difficult, but if it can't be fulfilled, a partial indulgence will be gained.