The final requirement is that you take part in the Sacrament of Confession, but you can do that up to seven days before or afterward. Since most Catholic parishes offer Confession on Saturday, you can go to Confession this Saturday, and then fulfill the rest of the requirements on All Souls Day itself.
The All Souls Day indulgence is a wonderful way to show your love for a friend or family member who has died. In less than an hour on All Souls Day, you can release a soul from Purgatory.