As with bullish swing trades, if the reward-to-risk ratio is acceptable, you could enter your trade using a sell-stop limit order. This would result in selling the stock short once it hits your entry point. Selling short is the process of borrowing shares from your online broker and selling them in the open market, with the intention of purchasing the shares back for less cost in the future. An alternative to short selling would be to buy an in-the-money put option. If you choose to use options, you would use a contingent order to buy the put after the stock hit the entry price.
If the strategy is within your risk limit, then testing begins. Manually go through historical charts to find your entries, noting whether your stop loss or target would have been hit. Paper trade in this way for at least 50 to 100 trades, noting whether the strategy was profitable and if it meets your expectations. If it does, proceed to trading the strategy in a demo account in real time. If it's profitable over the course of two months or more in a simulated environment, proceed with day trading the strategy with real capital. If the strategy isn't profitable, start over.
To offset this, day traders are often offered the "opportunity" to leverage their portfolios with more margin, four times the buying power rather than double. Taking larger leveraged positions can increase percentage gains to offset costs. The problem is that no one is right all the time. A lack of focus, discipline, or just plain bad luck can lead to a trade that goes against you in a big way. A bad trade, or string of bad trades, can blow up your account, where the loss to the portfolio is so great the chances of recovery are slim. For a swing trader, a string of losses or a big loss can still have a dramatic effect, but the lower leverage reduces the likelihood that the results wipe out your portfolio.
The most significant benefit of day trading is that positions are not affected by the possibility of negative overnight news that has the potential to impact the price of securities materially. Such news includes vital economic and earnings reports, as well as broker upgrades and downgrades that occur either before the market opens or after the market closes.

Trend Trading is a strategy where it is believed that a stock that is rising will continue to rise, or a stock that is falling will continue to fall. You enter the trade in the direction of the trend and exit once the price breaks this trend. Trend trading usually incorporates the use of trend and support/resistance lines. Click here for more information on Trend Trading.
ECN/Level 2 quotes: ECNs, or electronic communication networks, are computer-based systems that display the best available bid and ask quotes from multiple market participants and then automatically match and execute orders. Level 2 is a subscription-based service that provides real-time access to the Nasdaq order book composed of price quotes from market makers registering every Nasdaq-listed and OTC Bulletin Board security. Together, they can give you a sense of orders being executed in real time.