There are many things to consider, money being but one, albeit an important one. Bottom line, is the bottom line. How deep are your pockets? How much debt? How long can you survive without touching, or adding too, you're trading capital?
Make the move too early and you may regret it. Happened to me. Then you get to go back looking for a job trying to explain your day trading career. Makes for a good story at the interview, and the HR mopes are all ears when you're telling it. But at the end of the day they don't like free thinkers and risk takers in corporate America. They like worker bees that follow all the rules and don't take risks.
My advice...take jobs that allow you to trade, if not all day, at least part of the day. When you're consistantly profitable and have a comfortable nest egg to pay bills with, then and only then give it consideration. This is where those other things to be considered come into play. Things like life style, family considerations, your emotional well being and your general health. You'll have all the stress of trading, all the bullshit of a job, all the pressure of family life and you'll be tired as hell most of the time. What's that going to do to your head after a few months, let alone years? Lots to think about. Good luck!
As an adendum: If you're a single young buck, or buckett, still living at home with mom and dad, ignore the above. Put 5K together and hit the nearest prop firm. Worst happens, you learn some shit, go bust, and join the working drones like everyone else. Build your stake again and do it the slow way.