Yeah, I guess that's not impossible. There are many who actually depend on trading for earning their full time income and I guess, somehow they were able to cope.
What I am saying in essence is that, it wouldn't be a good idea to depend wholely on your trades for earning a full time income as the market for fluctuate sometimes and if you should depend on it wholely, then you should be sure that you won't have a constant stream of income. You might earn better this month and next month might not be so good. So I kind of see it as a risk and won't advice anyone to go for it.
The best thing to do is to try gain a source that you will earn a steady income so as to help yourself with whenever the market becomes bearish and not favourable. And most importantly, we should know that you can't just start trading from no where, you need to first make an investment from your money; hence the need to get a side job or business with atleast a steady flow of income.