Not well, at least for novices. Studies show over 70% of day traders lose money or at least underperform the market.
See for example this paper
http://citeseer.ist.psu.edu/275082.html
that shows day traders ("active traders") underperforming the market by -35%.
Or this one based on 135,000 daytraders in Taiwan that shows 80% of them losing:
http://faculty.haas.berkeley.edu/odean/papers/Day%20Traders/Day%20Trade%20040330.pdf
Here's a pretty good summary:
http://www.investorhome.com/daytrade/profits.htm
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