Thanks for the great help Supperman
There's one more question I'd like to add.
確かに些細なことにも気を配らないとな。皆が皆、香織 理さんのときのように上手くいくとは限らないのだから 。
I have checked the dictionary entry for 皆が皆, but I'm still not very sure about its meaning here. Is it used for emphasizing what the speaker said in the previous sentence, and the implication would be like "I have to pay attention to everything, and there's no exception"?