To do that we need knowledge, experience, and a little luck. In fact, no one can guess 100% accurate but if you have your own technique, reasonable entry and exit times, I believe it is still possible to make a profit this way.
Both knowledge and experience is a must thing for trading , but luck is needed more than Knowledge and experience because of the volatility of the crypto market. If anyone interest to trade altcoin than traders must be more lucky because of the volatility. So every traders need to be more punctual to get the right entry for buying/selling in the markets. 
