First I will advice you is that you shouldn't be too fast to quit your job for trading because you are now earning from trading. Before you quit try to make other alternative because it is not idea for you to depend on trading and have no hope on anything that is generating money for you. In trading anything can happen that you don't know how long you will be stranded, for now think of creating something else for income before making trading as your only job.
Having a job and still continuing your trading is less risky but if you leave your job and totally become dependent on trading then it implies to the fact that you are doing wrong thing as job can continuesly gives you profit but with trading you cannot face winning situations all the time.
If you leave your job just for trading so when you loss money then neither you will have income nor you will be able to get profit from trading therefore Initiation of both trading and job should be done at same time. Trading is very risky so do your job instead of wasting money in trading but if you have knowledge then minimum amount should be paid for trading and give equal time to both trading and job as if you focus more on trading then a time will come when you will not be interested in job.
Some people doesn't afford to do the both, which is trading and having a job cause just imagine being stressed at work then you would get drained at thinking analysis, looking at the charts, etc. It is not really advisable to leave your job since it's the stable income you get to provide all of your needs, cause if you are trading as a newbie, you would still be learning and not everyday you would profit so it's still risky. You can invest at yourself by learning trading and starting at a small amount first, from that you could already tell which one you should choose and focus with to get the fully potential and reach higher profits. Still, you must sacrifice one in the end of the day cause it's too tiring doing both.