A look at the attached link to a parts blow up indicates a fairly straight forward trigger/sear interface. The nose of th trigger (#26) directly retains the hammer(#24) by catching the notches at the bottom. Smoothing these notches will help a great deal. the trick is know how much to remove.. A good smith can likely do wonders..a poor one could create havoc.. Reducing the mainspring tension(replace the spring, don't shorten) can also help. I would polish the moving parts and sear/trigger interface first.. as well as the spring guide and hammer/trigger bearing(where the rub in the frame) surfaces. This is a simple and fairly straight forward trigger job for a good smith..
