Remove the two trigger guard screws, pull off the trigger guard. Remove the one screw at the rear of the trigger assembly and pull off the assembly. Put in the Davis trigger assembly. Reinstall the single factory screw. Reinstall the trigger guard and screws. You are done.
Some of us have found the Davis to be a hair to long and have filed or stoned the front of
the trigger bar (?) very, very, very slightly to obtain a good fit. If you need to do this go slow and check fit often. As stated, you won't have to remove much metal.