Would you be so kind as to expand a little on the matter so as to clarify the situation? I should like to be quite sure of how and when to use them.
In many cases, especially when the doer is known from the context or situation, you can safely omit both of them altogether to avoid any confusion on how and what to say.

Ex.
Рулетка! Строго-строго не суди!
Рулетка! Не хватает сил уйти!
Рулетка! Не загадывай вперед!
Наперво всегда везет.

Любэ - Рулетка