"As they say in Italy, Italians were eating with a knife and fork when the French were still eating each other. The Medici family had to bring their Tuscan cooks up there so they could make something edible"
To know where to put the pin you just make a mental note where the tang sits in the stag, also measure how long the tang is after the last leather. I don't glue it all up at once. I glued all the leathers and spacers then set them in a clamp. then I went back, once that was dry, and cleaned the epoxy off and then set the stag. then i drill according to the measurements and peen the pin over. Let me know if there is anything else I can help you with.