Removing bad habits

There are many techniques for removing bad habits once they have become established. One example is withdrawal of reinforcers identifying and removing the factors which trigger the habit and encourage its persistence. This type of observations that I keep reading lack the actual concrete and practical steps that can be applied. The best time to correct a bad habit is immediately, before it becomes established.

I don't think this is correct. A habit may be 30 years old. It takes only 30 days to replace it with a new habit. It's not yet clear to me if the habits are removed or overlaid or just their triggers renamed.