Difficult and easy are mental abstractions

[Joy]

In spite of said difference, it is generally more likely for "objectively difficult" projects (as described by Elro) to "kick back" with something unplanned for, in spite of one's confidence in aligning their preferences with task at hand.

Of course. That's just part of the trial and error that is necessary in order to move forward and eventually succeed. A person who is approaching the situation with ease will remain undaunted. A person who is not will be frustrated, disheartened, angry, or otherwise distressed and may even be tempted to give up, allowing an error to become failure.

At the very least, there is always that worst case where your sustenance could become jeopardized by mishap. And I know very few subjectively satiated people without food and shelter (although in a world of billions of diverse individual preferences, I'm sure you could find some.)

That's a different subject.

[Rubicon]

Of course. That's just part of the trial and error that is necessary in order to move forward and eventually succeed. A person who is approaching the situation with ease will remain undaunted. A person who is not will be frustrated, disheartened, angry, or otherwise distressed and may even be tempted to give up, allowing an error to become failure.

You seem to be taking it for granted that the situation will be under your control. What if a bunch of problems arose simultaneously that you were physically/mentally/emotionally incapable of dealing with at once? How would you approach them 'with ease'?