There should be three screws on the outside of the trigger mechanism that can be adjusted by a very small flathead screwdriver. Two on the shooter end, one on the muzzle end. One of the two on the shooter end of the mechanism should adjust the length of the trigger pull. This same screw also adjusts the sear engagement height. The longer the trigger pull, the higher the engagement height. Fiddle with that some, I can't remember which screw offhand, but that should be enough for a start.