For example, I dislike doing pullups. Many times over the decades, I embarked on a program of daily doing as many pullups as I could. I failed because it just took too much willpower.
I finally hit on a solution. I started with doing 3 pullups a day. 3 pullups are easy. It didn't take much willpower at all. After a few months, I "graduated" to 4, which then was just as easy. After several years, I am now up to 10, which is easy, and something I had kept failing at before.
You might think "why wait several years", but my goal with this is long term, so that doesn't bother me.