my experience of showing leadership in teaching starts with simple things.... having to fight to get materials back in the resource room, make sure the Ss tidy up before they leave the room, establish the rules with the Ss, and overall fighting to get it my way with temperamental teenagers (eg manage to still do one hour of lesson on the last day even if they've been promised a little party at the end) . Also selecting which complaints to listen to and how to deal with them. (eg is the activity really tedious or is the student moaning just lazy and unmotivated?)
Getting them back on track when the little 'diversion' from the lesson plan becomes side-tracking is the time when I have to lead them back on track.
And let's just remind ourselves that education is just this : educare in Latin means exactly to lead, to show the way,which should be the fundamental principle of 'teaching'.
Gd luck with your studies. very interesting topic