Replace it when th a good habit.

If you can't stop outright, whittle away at it little by little until you can stop completely.

"The Power Of Habit" is a great book. I gave up smoking 14 years ago. I knit blankets instead.

make up your mind 100% it is the first step.

A few suggestions are:

Create a penalty box (akin to a swear jar)

Spend time thinking about the habit before taking action

Understand what triggers the habit

Change your environment

Make small incremental adjustments

Coach yourself out of the habit

Obviously some habits are harder than others to break,

Create an action and a relapse plan.

no big deal, it's simply a matter of will power . . . how I wish I have it

Want to.

The first stage in giving up anything is realising you want to give it up.

First, you need to recognize that it is a Bad Habit then work to change. The key is to not beat yourself up if you fall back into it but still work to change it.