Waitaminute, preparing for an interview? Okay, so they use QADirector. QADirector is just a tool. Kind of like math and using a calculator. If you can do the math, then using a calculator will enable you to do things better/faster/etc. Similarly, if you know how to manage the test process manually, then putting the tool into play will allow you to be more effective.
That having been said, given that you are working on preparing for an interview, that will decrease the likelihood that people are willing to help you in this pursuit. Either you know your stuff or you don't.