You Will Fail

One of the most difficult things about being a QA engineer is knowing that ultimately you will fail. There will be some bug that you don't find and that customers do.

So how do you handle it?

Set your sights 10% higher than you could possibly achieve. When you fail to achieve that, you will have still achieved a good goal, and your failures will be acceptable.

More on this one later. In the meantime, buck up!