You don't have to be a 'rocket scientist' [=you don't have to be unusually smart] to understand the instructions.
Sales 'rocketed' from 1,000 units last week to 5,000 units this week.
The job is challenging, but it's not exactly 'rocket science'.
(..) 'What you got? That's what I'm talking about! That thing in your right hand is a blast shield. Perfect. Can you not hit me in the head with a rocket while I'm trying to drive?! Get me to the fence, Cale! - Stick that thing out there, go to work. - Damn right. Hold it with two hands, Mr. President. Oh, my God, that's President Sawyer. - He has a rocket launcher. - There's something... ...you don't see every day. Here it comes! - I lost the rocket launcher. - How do you lose a rocket launcher? (..)2013 White House Down