Anarchism doesn't want, surely, to gain power but to abolish it? Wherever real social change has been voted for, so my reading tells me, it has quickly been over thrown by the local military or foreign intervention. After Brexit and Trump I find it difficult, myself, to suppose that democracy or democratic thinking are showing much sign of increase.
You can't abolish power. Things need to be done.
Anarchism wants to spread power as far as possible. As many checks on power as possible.
Democratic control as far as possible.
I suppose my thinking is summed up in what I learned when I was about twelve: no man is good enough to be another man's master (and, in a more aware age, that would obviously apply to women). That is what I mean by power - general decisions are another thing - but those who object should have a way to get out, that's all.