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'.
(..) Oh, no! Dr. Pork Chop's attacking the haunted bakery! The ghosts are getting away. Woody'll stop 'em! Buzz Lightyear to the rescue! And we'll actually need the rocket. They're getting away! Come on, Bullseye! We need to get in the spaceship. The volcano is gonna erupt. Look! They're being attacked (..)2010 Toy Story 3