Stu: Ditto on the welcome. Here are two pictures that you will find useful if you are doing it yourself. If so, don't go near your gun with any old screwdrivers you have kicking around. If you do not have hollow ground tips and a good selection from thin to thick blades and narrow to wide widths you run the risk of damaging a family treasure. Check my albums on Second Chance Gun and you will see what can be done
(still a work in progress) by an average guy with some good screw drivers, some drift punches (brass/nylon preferred) a small hammer and a short length of 1/4 " dowel as a gentle persuader to remove the trigger plate. As Russ said, feed us some pictures when you get a chance. The schematic is for a Trojan.
Cheers,
Jack