I always trim as much fat as possible, leaving about 1/4 to 1/2" on one side. I then begin the smoke with the fat cap UP, smoke for about two hours, maybe three. Because I don't have the patience, and possibly my cooker, I then finish it over indirect heat for at least two more hours--first hour + fat cap DOWN, then flip and finish. IF temp not high enough to make the brisket tender, wrap in double foil (heavy duty), wrap in a couple of bath towels, and put in the oven (an ice chest can be used--too lazy to do that) and let sit for two to three more hours. Usually so tender and succulent--people scarf it up! I also rub with Jeff's rub the night before, and make his bbq sauce (a few modifications on each, but don't want to "hurt" Jeff's feelings! I should add I have a CB940X, with the original SMK attachment--a smoker attachment, no longer made. A steel "box" with cast iron "insides: that slope down to the bottom. Start a few briquettes, fill the SMK with charcoal, put the burning ones on top, followed by wood chunks or chips. WIll hold the heat for several hours--230-250 degrees. Just right for smoking. Start another small batch for the indirect part, mix the SMK ones with it and within five minutes have a fire that will go to 325-350 easily to finish off the brisket.