Hey everyone! I recently discovered the DS forums after being asked to run a SR4A game for a few friends. I've GMed other systems before, and have read a ton of the SR4/SR4A sourcebooks (and written fanfiction, but anyway), but since I haven't actually "worked with" the mechanics I worry that there's something I'm going to trip on without ever seeing it coming - which brings me to you fine folks. (I've tried searching the forums for similar threads, but "new gm advice" apparently caused the search engine to choke. )
So, my big question: What would you (plural) add to a "things I wish I'd known when I started GMing Shadowrun"?