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There are two primary divisions of professional day traders: those who work alone and/or those who work for a larger institution. Most day traders who trade for a living work for a large institution. These traders have an advantage because they have access to a direct line, a trading desk, large amounts of capital and leverage, expensive analytical software, and much more. These traders are typically looking for easy profits that can be made from arbitrage opportunities and news events, and these resources allow them to capitalize on these less risky day trades before individual traders can react.

A day trader often closes all trades before the end of the trading day, so not to hold open positions overnight. A day traders' effectiveness may be limited by the bid-ask spread, trading commissions, as well as expenses for real-time news feeds and analytics software. Successful day trading requires extensive knowledge and experience. Day traders employ a variety of methods to make trading decisions. Some traders employ computer trading models that use technical analysis to calculate favorable probabilities, while some trade on their instinct.
Day trading was once an activity that was exclusive to financial firms and professional speculators. Many day traders are bank or investment firm employees working as specialists in equity investment and fund management. Day trading gained popularity after the deregulation of commissions in the United States in 1975, the advent of electronic trading platforms in the 1990s, and with the stock price volatility during the dot-com bubble.[2]

Of course, you still have to factor in losses. Smaller gains can only produce growth in your portfolio if losses are kept small. Rather than the normal 7% to 8% stop loss, take losses quicker at a maximum of 2% to 3%. This will keep you at a 3-to-1 profit-to-loss ratio, a sound portfolio management rule for success. It's a critical component of the whole system since an outsized loss can quickly wipe away a lot of progress made with smaller gains.
Al Hill is one of the co-founders of Tradingsim. He has over 18 years of day trading experience in both the U.S. and Nikkei markets. On a daily basis Al applies his deep skills in systems integration and design strategy to develop features to help retail traders become profitable. When Al is not working on Tradingsim, he can be found spending time with family and friends.
Frequency and costs: A novice scalper has to make sure to keep costs in mind while making trades. Scalping involves numerous trades — as many as hundreds during a trading session. Frequent buying and selling is bound to be costly in terms of commissions, which can shrink the profit. This makes it crucial to choose the right online broker. The broker should not only provide requisites like direct access to markets, but also competitive commissions. And remember, not all brokers allow scalping. 
Define and write down the conditions under which you'll enter a position. "Buy during uptrend" isn't specific enough. Something like this is much more specific and also testable: "Buy when price breaks above the upper trendline of a triangle pattern, where the triangle was preceded by an uptrend (at least one higher swing high and higher swing low before the triangle formed) on the two-minute chart in the first two hours of the trading day."