yo can't predict what decisions other person is going to make. that it's only in films.. you can make a guess, but will be just luck.
Not actually only our luck will play in this situation. Our research and our knowledge about the trading markets would be most useful in this case. What most of the newbies think is that they could never predict the future for any coin and it makes them buy or sell at the price they could feel reliable just by speculating few buy and sell orders, volume, etc.
These few things would never help you to buy at a correct price as you would need a lot of other strategies which would help you to find better price for yourself to invest. Even the big whales are human beings and god has given them the same brain as we have so why not utilize it like them? Even you can find where the big whales might enter or exit if you have the ability to spend hours of your day in making huge research in front of your desktop.
Indeed, knowledge and being wise are two of the important things a trader or an investor should have because, without it, you would just be drifting into the market and is not capable to see the possible and potential coins that might rise or bloom in the future. A lot of people have earned a lot of profit by learning all about the current trends and new coins available in the market, so it recommendable for the newbies to first read about the basics and fundamentals in the market before engaging in trading or investments for them to avoid such risk.
Whales would mostly consists of a group of people dealing with various cryptocurrency or Bitcoin in the market, they own a lot of stock in it, you could see its movement mostly if someone sold a large volume of Bitcoin in the market, which could really affect the standing of a coin in the market.