imho, hierarchy is natural to mammals like us – but we, socialists/anarchists – must reduce as much hierarchy as possible and make all structure and leadership accountable to the group. This is difficult because cliques and circles of friends and so on form even in the most egalitarian of organisations. Mostly because it is easier for people, it easier to let people who want to do something do it, thus forming a hierarchy.
Most orgs i have been in have what i call a 'dictatorship of the doers' while others cannot do as much or choose not to, or perhaps feel intimidated or personally lack confidence or don't have the skill to 'do'.

Thus, the 2nd issue: distribution of responsibilities, of skills and the need for group trainings (which often do not happen within groups)

– @jd

A New #USA Declaration of Independence
– by #EmmaGoldman 1909

'...We hold these truths to be self-evident: that all human beings, irrespective of race, color, or sex, are born with the equal right to share at the table of life; that to secure this right, there must be established among men economic, social, and political freedom; we hold further that government exists but to maintain special privilege and property rights; that it coerces man into submission and therefore robs him of dignity, self-respect, and life.

The history of the American kings of capital and authority is the history of repeated crimes, injustice, oppression, outrage, and abuse, all aiming at the suppression of individual liberties and the exploitation of the people...'

https://goo.gl/MLm93a