Use the 'snake' method. It requires you to line the outer perimeter of the coals grate with briquettes in such a way that there are about 4-5 coals touching each other all around the perimeter with a break between the coals at one point. This will be your starting point for the burn. You then put lighted coals on top of one end or the other of your snake. This makes a slow burning, relatively low heat fire.
More coals means more heat; less coals means less heat. Experimentation will teach you how much or how little. Put wood chunks - not chips - on top of your briquettes about 6 inches apart around the ring. This will give you lots of TBS. I find that I have to close the bottom air inlets to about 1/2 open and the top ones about the same but wind and ambient temp will affect the heat level. I usually light it and check it after about 20 minutes for heat. If it's too high, I shut the vents a little. If too low, I open them opening the bottom vents first. You won't be able to set it like the oven on your wife's electric range, but you should get to within 20-30 degrees which is perfectly OK for pork butts. I have a Performer that has a decent thermometer in the lid, but before I got it I drilled a hole and placed one in the lid of my OTG. You don't have to have a thermo, you can use Steve Raichlen's 'hands over coals' method just as well. Check temp and fire burn every half to three quarters of an hour and use the vents to control heat. If you cannot get temps up, add a few more coals all around. If the burning coals are too hot, take the lid off occasionally to cool the CC down.
I've done several dozen pork butts and picnics with only one problem. On the first one I used too many coals and didn't pay enough attention and got a very, very thick and crusty (some would say, 'burned') bark.
Another option, if you have one, is to use the
Vortex placed in the center with coals in a ring around it being careful not to put too many coals in any one spot. This is easier than laying out a perfect snake because that can be a bit fussy.
HTH. Let us know what you did and how it came out.