Here are the rubrics from the Antiochian Service Book
It is traditional that the Lamentations at the Bier of the Mother of God be chanted at Great Vespers on the eve of the Feast.
Immediately following the Hymn of Righteous Simeon the clergy come to stand before the Bier (in which is the epitaphion of the Theotokos or the festal icon) that has been decorated with fresh flowers.
The order of the censings, Lamentations and litanies follows the same pattern as on the eve of Great Saturday.
At the conclusion of the Third Stasis continue Great Vespers as usual with the Trisagion Prayers.
If a procession will be made with the Bier, it occurs during the chanting of the festal Apolytikion which is repeated as many times as necessary.
Then the usual Great Dismissal is made.
See you all tonight!