When ancient dynasties declined, powerful courtiers deposed the original emperor before usurping the throne, and then established a new emperor, and after a period of time, the newly established emperor was deposed and replaced. So, since sooner or later we want to usurp the throne, why do we have to go through such a process, directly oust the old emperor from power, change the dynasty himself, and become the founding prince? In fact, there is considerable knowledge in it.

In ancient times, everything was done in a proper way, and if you act rashly, you will inevitably cause fire. At the end of the Eastern Han Dynasty, the masses rose up, after Dong Zhuo's death, Li Daiguo rebelled against Chang'an, resulting in great chaos in the world, the princes attacked each other, Yuan Shu divided Huainan and later a corner of peace, because with the jade seal in hand, he magnified his ambition to become emperor, and after Shouchun became emperor, Yuan Shu became the target of everyone, and finally the rebel relatives died of vomiting blood.
At the end of the Yuan Peasants' Revolt, xu Shouhui led the Red Turban army for a time as many as a million people, Xu Shouhui thought that there was such a strong strength, he could not wait to call the emperor jianguo, but at that time the power of the Yuan government was not completely destroyed, Xu Shouhui's army was too scattered to gather, was broken by the Yuan army one by one, Xu Shouhui was killed by his subordinate Chen Youyi when he fled.
Therefore, whether it is an emperor or a self-proclaimed emperor, it is necessary to ensure that it is not threatened by other forces. As the saying goes, build walls high, accumulate grain, and slowly become king.
After ensuring that he was not threatened militarily, he could gradually unfold, first deposing the old emperor, and then selecting the youngest and less intelligent people from the imperial family to become the new monarch. In this way, we can avoid the discussion of the people of the world, and we can also block the mouths of the courtiers.
After that, he began to use his own staff to publicize the appearance of visions in his hometown, with the sign of the Son of Heaven, and then wrote folk songs to spread the people, and then bribed some Yin and Yang families to deceive the people through stargazing. Such a time and place are available!
At this time, it could not be rushed, and Cao Pi, who had been on the throne three times by Emperor Xian of Han, "reluctantly accepted the position of emperor". Therefore, let the emperor issue a "self-condemning edict", or let the emperor say that he is cowardly and weak, and the monarch is disgraced, and he cannot govern the country well. On this grounds, it is reasonable to inherit the throne after many zen concessions.
Therefore, the transitional process of the newly established emperor can ease the attitude of the people of the world and avoid the notoriety of usurpation.