Copying others strategy seems easy but it is the toughest . Lets check out 

Backtesting

Every traders gets confidence in entry because of backtesting the strategy. So, even if you copy the strategy , you will not be able to copy the confidence :)

Win rate and Risk reward

Every strategy has a win rate and risk reward ratio. if you dont know them , you will not be able to follow it for longer time

Trading Style

You might like a positional strategy which needs patience. To follow the same your personality should match with trading style