When you make a decision to be happy, it’s not a technique. You just have that will to keep your calm and not participate in any disturbance.
It’s not always easy practicing how to be happy, because of the conditioning that pulls you to react with disturbance. Conditioning is all the rules that come when we are facing a challenge in life. We react, thinking, “I should stand up for myself, I shouldn’t let that person scream at me like that, he has no right, I should quit my job!”
These thoughts or conditioning come in, but if you have made a decision to be happy, to not let anything disturb you, then there is something inside you that uses will and strength to be calm, to be relaxed.
At first, you’re not so good at it, but as long as that decision to be happy remains, next time it happens you get better at it. You get better and better, and you get disturbed less easily.