Start a full chimney on a turkey cooker or however ya want. Dump said chimney into a 1/2 sheet pan. Pull the fire tray out of your cooker and set the 1/2 sheet of lit coals on the ash pan and close it up. Set the guru to your desired temp. While the cooker heats up, get your fire tray filled with coals and wood leaving a void in the corner where the fan blows. When the cooker reaches 200 Add hot tap water. At 220 replace 1/2 sheet pan of lit coals with your fire tray putting 10-15 hot coals in the void. When the cooker gets to within 10 degrees of your cooking temp. Damper down the guru.
I do it this way cause I dont have to use my cooking fuel to heat up the cooker then.
I also use Briquettes as I think lump burns too hot and less consistant.
MJH From Backyard Bomber BBQ -- Junior
YS 640 Comp
22.5 Weber Kettle
Wine & Swine