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If you scrupulously trail all events, micro factors and macro factors, you have a much higher chance of success in making your predictions. But you should understand that this is not easy. There are some sites that offer so-called free Forex predictions, but you should avoid them, as they are not reliable. To track economic announcements, forecasts, and other important information related to Forex, many professional FX traders use a Forex Calendar.
The Tokyo session follows shortly after. This session is also called the Asian session, because right after Tokyo large economic hubs like Singapore and Hong Kong start waking up. The Asian session starts around 00:00 GMT time, when most of Europe is in a deep sleep. This is why you often hear European traders talking about waking up at 3am to trade the Asian session before going back to bed.
So, yes, at any given trading center, it's an eight hour day. But that really doesn't matter, because somewhere in the world trading centers are open. You can trade anytime you want, although you should also note that you'll get the narrowest spreads -- the broker's profit margin -- when the maximum number of trading centers are open or, more precisely, when the trading volume for your currency trade is greatest. 

Investors should stick to the major and minor pairs in the beginning. This is because it will be easier to find trades, and lower spreads, making scalping viable. Exotic pairs, however, have much more illiquidity and higher spreads. In fact, because they are riskier, you can make serious cash with exotic pairs, just be prepared to lose big in a single session too.
^ The total sum is 200% because each currency trade always involves a currency pair; one currency is sold (e.g. US$) and another bought (€). Therefore each trade is counted twice, once under the sold currency ($) and once under the bought currency (€). The percentages above are the percent of trades involving that currency regardless of whether it is bought or sold, e.g. the U.S. Dollar is bought or sold in 87% of all trades, whereas the Euro is bought or sold 31% of the time.
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The need to exchange currencies is the primary reason why the forex market is the largest, most liquid financial market in the world. It dwarfs other markets in size, even the stock market, with an average traded value of around U.S. $2,000 billion per day. (The total volume changes all the time, but as of August 2012, the Bank for International Settlements (BIS) reported that the forex market traded in excess of U.S. $4.9 trillion per day.)