"And what will I do if THAT doesn't work?"

Contingency plans are important. Having a backup plan has saved many an important project, presentation, and/or deliverable. But sometimes it makes sense to have more than one alternative at-the-ready. The key question to ask yourself is this:

"And what will I do if THAT doesn't work?"

Overkill? Maybe. But the logic is clean - if it's important enough to get it right, then best you know what to do if things go wrong.