No matter how much an expert predictor is and how much is his success story they will always be a time when thier prediction will be wrong and you never know which match his prediction may get wrong and you will lose your money if you follow him blindly. Due to this reason it is always advisable that after getting some idea from the prediction you should always think from your mind as well and then decide whether to bed on that team or match and the another important thing is how much amount you are going to place for each particular bets.
And this is when money management skills will help you out, after all even if there was a gambler out there which could beat the casinos with their strategy, if the go all-in in every single one of their bets then they only need to fail at their prediction once to go bankrupt.
However if they only risk 1% of the capital they use to gamble then even if they were to lose 20 times in a row, something that is not as impossible as it may seem to some, then they will only lose 20% of their capital, a significant loss but one from which they can recover with enough time.