His life has been legendary. He has always been exceptional. But things are different this time. For one, he is the only one he knows who has ever attempted what he is doing. There are no others.
Secondly, the difficulty of what he has to achieve now is beyond the combination of everything he had to overcome to reach this point.
What he is attempting to do is similar to what kings of law have to go through to become titans of law. Many kings of law fail to even become titans of law with a single law. But he has to use 10 laws.
He and any other person don't need to imagine the difficulty. The difficulty is clear to everyone because if creating a concept with six laws were easy, the realm would already have a realm lord. It wouldn't be the turn of a god to act as the protector of the realm.