You'll Figure It Out

Yeah, in 10e+20 years.

When it's best to leave the main characters with minimal directions so then they can go through an adventure of trial-and-error. If they meet an enemy who appears to be invincible and isn't immediately showing any weaknesses, just leave the Main Group to experiment with the enemies. Just like life and evil, they'll always find a way. The Plot Said So. If there's a machine that they can't quite work properly, leave them to press the buttons wildly. Nothing bad could possibly result from haphazardly screwing around with the system of a highly-complex machine.