There is no easy task on this list, and there is no month in which a person owes nothing to anybody. Each of the twelve calls for work, and comparing them with one another makes no sense — there is no fortunate month of birth and no unfortunate one.
Something else matters more. A task within the lineage is not a sentence and not a debt that is collected. It is an indication of where exactly a person's efforts yield the most: where the line broke off, any step weighs more than usual.
And one thing further: it is the descendants who work off the lineage, but nobody answers for somebody else's choice. What has come down to you can be worked through, but the guilt for it does not have to be carried — guilt is not inherited.