Assuming you know how to basically disassemble the Woodsman. 
To remove the firing pin:
There is a tiny slot screw, which is part of the extractor, at the extreme left side, inside the slide near the firing pin.
Using a small jewelers screwdriver, rotate the screw/extractor 180 degrees.
You can now remove the extractor section from the front.
After this, using the screw that held the handle grips together, screw into the round pin near the firing pin.
Release the pressure on the firing pin by pushing in on the firing pin using a small screwdriver and pull the round section out that has the screw in it.
This will release the firing pin so it and the spring can come out.
Reassemble in reverse order.
To remove the firing pin:
There is a tiny slot screw, which is part of the extractor, at the extreme left side, inside the slide near the firing pin.
Using a small jewelers screwdriver, rotate the screw/extractor 180 degrees.
You can now remove the extractor section from the front.
After this, using the screw that held the handle grips together, screw into the round pin near the firing pin.
Release the pressure on the firing pin by pushing in on the firing pin using a small screwdriver and pull the round section out that has the screw in it.
This will release the firing pin so it and the spring can come out.
Reassemble in reverse order.