How do I trim fat down to an even layer?
This may sound ridiculous, but I cook the meat to about half-done before I trim it. Then just use a filleting knife, the same one I use for fish, and I insert toothpicks to the depth where they encounter solid meat, so I can judge how thick the fat is. Then I just fillet the fat off, using the toothpicks as a depth guide and removing them as i go, and I peel the sliced fat back with a fork. You should be able to get it all off in one sheet.