When to leave the daily job and plunge into full time business

Many of us will be in a situation we are having a business idea and are also doing a daily job. You may encounter many questions like what is the exact time to leave your job and work full time on your business? Business welcomes risk and excitement while job is accompained with security and less excitement in work.

There are many who do both the things - do job from 9 to 5 and then go home and do their business on a small scale. Now a time comes when your business starts earning you some amount of money ( not more than job but certainly a good amount). This is the time when I think most of us are confused the most!

How do you tackle such confusions? Have you been through such a situation?