This is a misreading. Relying on your own judgment does not mean that you need to be an island who thinks that they know better than anyone else. What it means

This is a misreading. Relying on your own judgment does not mean that you need to be an island who thinks that they know better than anyone else. What it means is that your judgment is founded on your own critical thinking, which still allows you to recognize when you lack some experience and perspective and defer to the wisdom of others when necessary.