I just did my first brew yesterday. The only problem I had the whole time had to do with the dry malt extract. I cut open the bag about 2 feet straight above my burner, the bag slipped and a small amount spilled out of the bag, floated slowly to the burner and caught fire, I wasn't expecting it so when it flamed up I jerked backwards causing more dry malt to fly into the air. My wife said it looked like I was more or less engulfed in flame. As impressive as it may have looked, it didn't burn long and I'm only missing some hair on my right arm and my mustache and right eyebrow got singed.
So my tip is to remember that fine organic powder is pretty flammable when suspended in the air.
My wife and I really enjoyed the whole thing and we plan to do it all again, hopefully minus the being engulfed in flames part.
Oh, as a final note, we were using the burner from a propane turkey fryer, we had the forethought to have a fire extinguisher close by, but it wasn't needed in our case.