(fill in your own blank)
....you are asked to design something that you know absolutely NOTHING about?
But Kris, that's when it's most fun! It means learning something new, doing research, exploring. Doing the same thing again is boring. Of course, if the design was needed yesterday, then, agreed, no fun.
True....I'm in a brand new field as of February and I've been asked to design a piece of equipment from start to finish. I'll muddle through!