Have you removed the barreled action from the stock?
You'll be able to see of it is an Accutrigger, easily. On the back of the trigger is an exposed, vertical compression spring. Lightening the poundage just means turning the spring away from the rifle, so lefty loosey (counter-clockwise). It's like a flat head screw driver, so you need the female of that. I've backed them off by using a tiny flat head screw driver, like an eye glasses sized tool, and just chase the spring around the hole it is sitting in. Once you see it, what I'm saying will make more sense.
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