There you are, the way to remove a pin with a full technical description. Obviously things are not so smooth and easy as Philip's put them, with all his experienced expertise, although possible to carry out by a person with a minimum ability.
... contrary to my humble self, with only one (non dexterous) hand ... and no rubber sheets at hand; such exercise becomes a saga
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Last time i succeeded in removing a pin the gun, a rustic blunderbuss that was well worn, the stock wooden hole was too large from overuse, but the pin was rusty and stuck into the barrel lug.
One other time i had another worn gun missing the pin; i used a normal nail, cutting it to the necessersy length and leaving its head, to better lock on the worn woden hole. A couple minutes on the stove flames turned it dark enough to eliminate its shiny brightness.