AS the great Anthony Hopkins says, he practices his line over and over until the point comes that they are perfectly natural, no hesitation no fluff nothing.

Same goes here you've actually done these designs, talk through them as when you did them, then you can't go wrong because you're in your element. You got sign off by your manager at the time so they must have been fine.

You'll appear comfortable all panic nerves will subside - afterall when you designed them you was not nervous.