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'.
(..) - No! It has to be this way! - No, I need that! Anyone know what this is, and do you need it? I think we could use wings and rocket boosters. Ew. Get your retro space stuff out of my area. You guys, hey, just tell me exactly what to do. And how to do it. Emmet, don't worry about (..)2014 The Lego Movie