... do not, repeat NOT, put any instructions between the Great Thanksgiving//Breaking of Bread and Distribution of the Elements.
So many do this!?!?
Instructions for a meal take place before the meal not during it.
The profound fellowship with our Lord during Holy Communion is brought through the interplay of word and action, of Word and Sacrament. To intrude into the middle of the sequence instructions about wine or juice, chalice or small cups, standing to the left or moving to the right should be anathema!
Instruct (if required) before the Great Thanksgiving and let the great prayer and reenactment of the Lord's Supper be a seamless robe of words and movements.
No instructions in the middle.