They did it in 1950 with an army filled with veterans who had fought alongside the Chinese Communists in the Chinese Civil War, against a weak and untrained ROK force.
Not a soul in the current DPRK army has an ounce of large-scale conventional combat experience and the ROK army is infinitely larger and better equipped today than in 1950.
Not something I'd want to bet on.
OTOH, his generals likely are more or less rational, and if they don't fear him too much, might refuse such orders and arrest him instead. We can hope so anyway, but we can not count on it.