It’s not that hard to learn how to juggle.
It requires some practice, but most people can eventually master it.
It’s not that hard to learn to ride a unicycle, especially if you have good balance.
It’s harder to learn how to walk a tight rope. It’s a combination of technique and managing fear. Hard, not impossible.
It’s however, hard to juggle while riding a unicycle. Not just twice as hard, but multiple orders of magnitude. It is also hard to ride a unicycle on top of a tight rope. This kind of feat is reserved only for circus professionals and trapeze artists.
Now, it’s close to impossible to do all three; riding a unicycle on a tight-rope while juggling. So much so that very few people on the planet ever manage to do this.
Complex things have this interesting character that they’re often due to the compounding complexity of relatively simple things.
Decomposing complex things into simpler, more manageable chunks is a skill that can be learned.