I do the same thing that is in the video, but I use my middle finger and the trigger is swept back. The trigger is personal preference, as you can do it with any release based on what feels right for you, but the key to the whole thing is having the correct amount of tension in the release—something on the medium-medium heavy side will work best, as you want to apply pressure without it going off.
As far as curing the underlying problem, there are two things you need to do. First one is blind-bale shooting—this will help with proper shot execution without your brain getting in the way. The second is an aiming technique, specifically designed to keep your brain from controlling the shot and building confidence—this will correct what is going on inside your brain and re-train your brain that you can hold on the target until YOU are ready to fire, and not the other way around. Get a blank pie-plate and step in front of it at 5yds. Draw and get the pin in the middle on the plate, let it float around, and count to five and then let down. If you can hold in the pie plate for at least 5 seconds, take a couple of steps back and repeat. Keep doing this as far back as you can go. However, it is extremely critical that you do not fire that arrow intentionally, or it will erase everything you have done. If you cannot get to 5 seconds without jerking, snatching, moving, etc.... start with 2 seconds and work your way up to 5 seconds. After you can get back to 40-50yds and can float the pin on the plate for 5 seconds, cut the size of the pie plate in half and repeat the entire process. After you can do that, then use a normal size target dot and repeat. Then apply what you have practiced, doing the same exact thing, except this time start shooting at close ranges (5-10yds) and working your way away from the target. At any point you start to feel anxiety creeping in, or can't hold to five, move forward until that anxiety is gone.
I know this sounds time consuming and you may not fire an arrow for weeks, but this is the best way to regain your confidence that you can hold on the target and re-train the brain that is controlling your shots. After completing these exercises, and including them into your practice sessions, you will become a better archer—this is good for anyone! I learned this from one of the country's top Olympic coaches and have read and talked to numerous Pro Shooters, World Champion Levi Morgan, being one of them, that these above methods are part of their practice routines to stay on top of their game.
If I can help let me know.
