system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How sure was Palpatine of his plan to become emperor?

There are plenty of instances where Palpatine will be in extreme and unpredictable situations, yet he always seems so calm. In episode 3 when anakin lands the battleship, he doesnt seem worried at all.
gpt
That's Palpatine's secret, he's never calm when he appears to be, because peace is an illusion. 

Despite his abilities with the dark side, He didn't see every curve ball coming, the future doesn't work like that. Even if the force allowed complete vision (it doesn't), the future is always in motion, so it's always changing. Besides perfect prescience doesn't leave room for free will, which is a central theme to the two sides of the force. Anakin could have helped Windu, brought an end to the emperors scheme (depending on if you EU or not), but his choice to save Palpatine doomed the Jedi order.

So in summation, Palpatine could not have been certain, he could have been confident in his abilities as a Sith Lord and a master manipulator, but it was his skills and talent in the end that pulled off the Jedi Purge and the formation of the empire. To steal a quote, "If it was destiny, it sure did a good job disguising itself as talent and hard work."