Warren Buffett has said "Be greedy when others are fearful and fearful when others are greedy" . Is there all there is to it?

Sometimes you should be greedy when others are fearful and fearful when others are greedy.

There are also times when you should be greedy when others are greedy and fearful when others are fearful.

These two conditions occur rarely. Most of the time what other's think is not relevant. They should be shut out and you must think for yourself.