Okay, so here it goes.
I prep my brisket by soaking it over night in a mixture of Soy Sauce, Liquid Smoke and Worcestershire sauce. this helps to bring out the smoke ring.
after the soak I will generally trim most of the fat, but I don't throw it away. I will then place it in my smoker and smoke the meat for about 4 hours with very little direct heat. Smoking is not cooking, Smoking is the flavor process. I only smoke with Oak, but you can use any wood you want.
After I smoke I will take a cup of Mayo and put a layer over the meat and apply a dry rub. The mayo does nothing to the meat as it melts off but it does cause the dry rub to stick better to the meat. I will then take tin foil and place some of the brisket fat on the bottom place the brisket on the fat and then add more fat to the top. I wrap it air tight in the foil and place it over a heat source at about 225 F. and flip it about every hour. 225 will cook at 11 lb brisket in 12 hours, you want to get the think part of the brisket to 160.
I will check the meat after 6 hours and spritz it with water or some liquid I like to experiment with. Don't be afraid to move it to fresh tin foil if you tear it. the best briskets are cooked in air tight foil.
That is my method for brisket. I never get complaints. The hardest part is getting the cook time correct. I always try to stick with a brisket of about 9 to 11 lbs as it helps me keep my method consistent.