Do people this part of the forum believe this is possible?
How would they approach it?
How do they incorporate it in there lives?
Do they hide it from themselves?

Excluding cases of certain types of mental illness and buddhist monks, ignorance is not bliss.

Almost every idiotic person with a disposition toward ignorance, instead of learning, eventually pays the price. You don't have to look far to take notice of this.

In a world of increasing complexity and competition, the one who learns less is far less adaptable, and hence suffers far more.

I think people who aren't aware that they're being ignorant might (in some cases) be happier than a clever guy. But if you know that you're being ignorant then it's too late and you won't be truly happy (imo).

I have found the opposite to be true. I very much enjoy learning and thinking.

Plus the question is a contradiction. By definition if ignorance is +EV then not knowing that fact is also +EV.

I think it's likely true, but it would be very hard to test. The mechanism I think is responsible is called "depressive realism," which more or less states that most people use erroneously optimistic beliefs and outlooks to buoy their mood. I think the evidence is fairly convincing, and the counterevidence not so much, but I'm biased.

As for making it happen, heh, if you're in trouble with this I think you're pretty much screwed.

Compared to someone just sitting on a beach, you will most likely be more unhappy than them if you think the sum of the world's knowledge means anything more than a handful of sand means to a man on a beach collecting sand.

It's great to have extra grains in your hand - and those extra grains do make a meaningful difference vs the other people who do not have hands full of sand on your beach (and you may even come one grain closer to understanding what sand really is) - but what you have is still just a handful of sand on a beach, and the guy who could not care less about sand probably has more 'fun' on that given day.

tl:dr acquire sand and don't worry about what sand you have.

So that's what it's called.

The Dawn by W.B. Yeats

I would be ignorant as the dawn
That has looked down
On that old queen measuring a town
With the pin of a brooch,
Or on the withered men that saw
From their pedantic Babylon
The careless planets in their courses,
The stars fade out where the moon comes.
And took their tablets and did sums;
I would be ignorant as the dawn
That merely stood, rocking the glittering coach
Above the cloudy shoulders of the horses;
I would be -- for no knowledge is worth a straw --
Ignorant and wanton as the dawn.

You're equating success and happiness, and I think that's a mistake. There are plenty of examples of successful unhappy people and poor happy people.

I'm not saying Ignorance is bliss, but I do think you've approached the problem incorrectly.

Actual future happiness is a lot more robust than people's expectations of their future happiness, so there should be lots of situations where worrying for some amount of time isn't worth the change you can affect by knowing and acting. And the less control you have over your future outcome, the worse knowing something bad is (or could be) coming will be.

I'm not equating success and happiness. I'm equating adaptability and happiness. They're two very different measures.

Shirley, you're not equating but correlating?

Nice nitpick. You deserve a cookie.

That's no more a cookie than this is a pipe

If you want proof that ignorance doesn't bestow happiness, go read the comments section attached to just about any online news story. It's a collection of human misery.