and on days with high volume trading can be very profitable.
Exactly, there is no other "method" for trading. This is the only way you can trade and be profitable.
Where do you usually trade? any tips or site?
Learninig how to day trade, can learn on other actual fiat sites like eg: timsykes, etc.
The question is either can you use the same style for bitcoin. Some people are suggesting to buy here or whatever at this price. But, I dont think its wise to "chase" trades.
There is a trading technique called Dollar-Cost Averaging, implementing which allows you to buy shares (for example) below the average market price in the long run. The technique consists in regular purchases of a relatively small fixed dollar amount of shares. In this manner, more shares will be purchased at lower prices, and less shares at higher prices, so the average cost per share will be diminishing with time. I see no difficulties in applying this technique to trading in bitcoins (though I didn't try it out personally)...