One of the reasons that advice fails is that the exact same task can be radically different for two different people.
Let's take a couple people who procrastinate by spending too much time on entertainment, and want to stop it.
One plays Magic the Gathering online; the other watches a lot of movies.
For many people, quitting either activity -- or scaling back -- would be rather easy.
But if the guy playing Magic used to play during a really hard time in his life, and it was his only sense of mastery and achievement during those times, it might be a great source of feelings of self-mastery, it might be very self-soothing, and so on.
Likewise, if the guy who is aggravated he's watching too many movies was watching a classic movie per day during the best time in his life, when he was really thriving, he could be trying to recapture that magic. The associations are different for him.
This is before getting into differences in how we think, our values, and so on.
What's the takeaway? If it's aggravating for you that quitting something, or adopting something, or changing something is harder than it is for others -- well, don't fret too much. Many things come easier or harder to each one of us. People beat themselves up over this constantly, despite it being totally normal.