You can choose delegates with some sphere of autonomy in a horizontal way, but in anarchist association you can instantly recall them in a horizontal way too. This helps mitigate creating hierarchy while giving someone autonomy and making it possible to divide labor.
Who can instantly recall them? A group vote or an individual? Because one of them is just democracy and the other is utterly unworkable. The first time someone doesn’t want to work, they’re going to “recall” the boss.
Direct democracy, ranging from majority vote to some kind of consensus or consent. Considering someone not working - in anarchy you can always pick with whom you associate with so you can just not associate with a persons who you feel is too lazy.