Indeed, even how sure you are placing your bet with a heavy favorite there's still a chance of suffering losing your bet, we just need to remember that we are inside gambling, and even how small the chances of losing upset can still happen to you, though there are many gamblers who deeply assess the game before placing their bets and most of them manage to win with the same strategy but there's no assurance that you can keep winning as what I mentioned that underdogs can bring upset to a heavy favorite.
We can't be sure with our bets because we must realizes that the match can change anytime and that can makes us select the wrong team. That's already happens in many matches before so we must be careful selecting the team and we don't have to had a big hopes that our wins will win. If we can used gambling as a fun things and one of the entertainment, we will not too passionate to chase the wins. We will act normally with place a bet and lets the things happens. We will not feel upset with anything happens, including if our team lose in the match because we knows that the opposite team can beat our favorite team. We can analyze the match carefully to knows which team have the big chances to win but we must be ready if we lose because a change in the match.