First, wear safety glasses as springs do fly. Second, put the assembly in a plastic bag to trap any stray flying parts. Use a fork slipping the hammer strut between the tines to compress the mainspring to remove the cross pin used to trap the spring during disassembly. What I do on the trigger assembly is tape the trigger to the front part of the trigger guard to prevent movement to the rear BEFORE removal from the frame. When out, if it moves to far to the rear the spring and plunger for the hand that turns the cylinder will launch, hence, one good use for the plastic bag.