Perception is so important in facing a diffcult situation. Eliab's perception was wrong. Saul's perception was wrong. David's perception was right. We need to look at it from past experience.
Perception is the first step.
The next step is preparation. That is when King Saul blundered. When he finally agreed to let David fight the Goliath, he offered David his armour. When we attempt to face a situation, there will be people who will try to help us. They are well-meaning and sincere.