From past experience, the pins that hold the end on are hell to remove. KBar makes a leather leather handle kit, may the manufacture of these has one.
When we did it, it we drilled the pin ends about a 1/18 inch deep then used a punch to drive them through. Save the pin, you will want them when you look for a replacement pin. The leather we used came from Tandy, once you have the pommel off you will see how the hole was cut in the center of the stacked leather pieces. For this watch some youtube to see how that the leather pieces are cut and stacked. You want the leather pieces bigger than the finished size, so you can shape them after every thing is glues together..
I have made a lot of stacked leather game calls using old leather belts from the resale shops. This is walnut ends with leather midsection.