when did you know?

Ive never seen this topic discussed on HC but here goes. When did you know it was time to stop working you're normal job and start trading full time?

I am at the cross roads where my job is getting in the way of my trading and in theory I would be earning much more trading than I would in my job.

So what are some of the things to consider when making this important decision? And how did you know you were "ready"?

Was there a certain capital amount you were aiming for before before you thought you could survive on it, or did you also have a time factor?