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yes, you can make enough to support a family. But I wouldnt just quit your job today.. You should make sure you have saved up a safety net worth of income .. maybe 6months worth to give yourself a real chance.. and you can start trading with any amount of money, but depending on your present income, I would begin trading with 5 times what you want to make per month.. that way you just have to grow your capital by 20% per month, which is pretty doable.. and with a 6 month coushion you should be able to have a few bad months without running into trouble..

Honestly, i prefer trading without any number to reach.. I just take what the market gives me.. and if i dont make anything today, thats fine by me..

I meant only trading part time. I enjoy my job but would like to have an additional source of income. Is it worth trading part time or would I miss the good market changes?

you only have to change you chart timeframe.. 1 hour bars .. you can easily swing trade off that, and hold for a few hours to a few days