Like Linda, I use the kiln when I have pieces that are too big for simple torching - or I have multiple pieces that need firing - or they have stones that won't take the heat of torching (ah...torching...my favorite method.....much faster, immediate gratification!).
I use mine in my house, on my stove. I put my soderlite board on my gas burner, then put the kiln on top of that. You DO need the ceramic inserts....and as Linda pointed out, you need to make sure your PMC is completely dry (that is true for any firing methods!).
It is not a big deal when it flames....you get bigger flames from torching :~). Just let it burn out (I put on my stove vent for a while).
I too, let it 'pre warm' for 30 mintues and then usually let it go for two hours.....but I keep my eye on it. You definitely DON'T want to put on the cover (the kiln will get too hot and melt your piece).
If your pieces don't have stones in them, you can quench them in water right away, after you unplug. If my pieces have stones, I remove them from the kiln, but lay them on the soderlite board to cool naturally.
Pretty simple! Have fun!!!
DG
Dragon Skin Designs
http://www.dragonskindesigns.com