Looks like more trimming than I do. I think I leave more fat than others here. For a 14 pound whole packer brisket, I trim about 2 pounds at the most. I don't trim any area unless it is more than 1/4 inch. And generally leave 1/4 to 1/2 inch in the thicker areas. I focus mostly on sculpting down those really huge globs of fat. Where I leave the fat thicker, I do a criss-cross score through the fat, to help the rub/brine get to the meat, and help the fat soften as it cooks. I figure my guests can always remove any excess fat that they don't want to eat (it seems to all get eaten!).