In the first place you can really trade even if you don't have a source of income especially if you have an idea or knowledge here. Because for sure you can get profit here little by little.
This is just an example, just ask for funds from your family or friends.
the drawdown gonna be painful though if somehow OP gets caught in the middle of flash dip and as it happens, he opened long position.
the main reason why people keep saying we need source of income to trade is to make sure we have something to stand on.
but there are plenty of story about how people starting from the bottom building their capital with just few hundred dollar as a starter, if OP really sure he can pull it off. maybe it's worth it, but if he can't, maybe start finding income first.