Day trading requires a lot of analytical skills to predict trends. The only downside to day trading is brokerage fees and CGT. If you're trading using $100k then maybe your profits will cover the brokerage fees but when July comes the taxman will have a field day sucking your blood. I suggest negative gearing through taking up an investment loan as the interest repayment can be used as tax deductions.
Then again if you're a newbie at day trading I suggest don't get into day trading just yet. If you make the wrong move you might end up insolvent and not getting your dick wet at all.