It's one of the hardest things any leader will ever have to do. Jobs said as much repeatedly. Older Jobs lavished credit onto his teams because he knew very well how hard it is to put them together and keep them together. And if you can manage to acquire them, and if you can manage to retain them, you have to then manage them as an individual and in function with a lot of other people that will inevitably clash at times (egos, conflicting ideas/visions/paths, whatever it may be).

Assembling top talent is something very few can do. Assembling it and then keeping that talent together and getting it to work in some manner of harmony, almost nobody can do that, it's an extraordinarily rare skill.