Is it obligatory to act upon the Prophetic Sunnahs and to persevere in them before disseminating them to people?

The most complete approach for a caller to Allah is to enjoin good and practice it, and to forbid evil and abstain from it. However, if he refrains from doing good deeds, he must still continue to enjoin them, as he is obligated to do both, and one does not fall away by abandoning the other. What he enjoins of the obligatory, he must do; and what he enjoins of the recommended, it is desirable for him to do, as Shu'ayb said to his people: "And I do not wish to oppose you in what I forbid you from. I only intend reform as much as I am able. And my success is not but through Allah. Upon Him I have relied, and to Him I return." Therefore, continue to spread the Sunnahs and strive to practice them as much as you can.