I finally got to GM Dungeon World!
Yesterday I took on seven players (note to self: that’s way too many, even if you know the rules like the back of your hand — which you don’t) in a completely improvised half first first session.
Today I ran three players (a much more manageable number) through half a second first session.
Verdict: We all liked it, but I have to train my improv muscle.
When time allows, I will write a more detailed log.