figures of speech, and folding paper

Hank spent every spare moment this weekend folding paper to make origami dragonflies. When he wasn't in the graduation party pool or decorating his favorite neighbor's driveway, he was teaching friends and grandparents how to transform flat squares into very special three dimensional figures.

At one point he said Mom, I'm getting so good at this, it feels as easy as picking a flower.

 

I admired his simile, and wondered how he might describe something that felt difficult. He thought for a moment and said Maybe as hard as counting to infinity? But that's actually impossible, and nothing else is impossible. So maybe: As hard as counting to a million.