Well I would start by backing off the two on the rear of the trigger and concentrate your efforts first on the sear engagement screw where the step is.

Once you get the trigger where you want adjust the one for the safety. When the safety moves back it will move under the rear set screw. You want to screw it down till it hits the safety and back it off just enough so the safety doesn't drag on the screw. Test the trigger with the safety on and make sure you Cant trip it. If it goes off the tighten the screw a hair and try again. Next adjust the screw next to that. Its the over travel adjustment. Too tight the trigger with hand up on the sear after the gun goes off.

This is standard three screw stuff you have four. Not sure is the forth is spring tension or what

First things first get a sear return spring in there fyi its a pain to put together. I hear its easier with the trigger shoe removed