Wolf includes an XH firing pin spring with their recoil springs. They recommend changing the firing pin spring when you replace the recoil spring. Assuming that you are changing the spring because it is worn out and in need of replacement. In your case you are changing it for a different reason. Your Trophy Match (if it is a 2001 model) should have an XXH firing pin spring along with a titanium firing pin. You can change it if you want to but I don't see a reason to in my opinion. To change it use a punch to depress the firing pin. Push the firing pin in far enough to release the tension on the stop. While the tension is off of the firing pin stop it should drop out of its slot in the slide. Be careful because the firing pin is under pressure and will come flying out. Wear your safety glasses. I usually use an old towel to capture the firing pin and the spring. Assemble in reverse order. Hope this helps.