I absolutely agree with all the above.
First check the sear clearance, with the gun checked as unloaded, hand, breech and t'plate pins tight, take of the safety and check that there is clearly detectable fore and aft movement in both triggers, 1mm at the tip of the trigger is a rough rule of thumb. If not, your sear clearance is insufficient and may be holding the sear partially out of the bent.
You certainly can strip and check what is going on inside but if the sear clearance checks out, trigger pull adjustment is not for beginners. I have been doing them for many years and they still give me headaches every now and then.
One big problem of 'having a go' is that you may well land up reducing the length of the sear nose significantly which will reduce the tumbler strike power and may throw your ejector timing out as well. Only solution then is to have the sear noses built up with TIG and re-cut to shape. You will wish you never started!
