Figure out where the barrel needs to go to with the bolt. Ideally the bolt should hit the receiver and head space right. I don't have 32 acp gauges so I set it up so the bolt hit the receiver and cartridge at the same time. Since its a blow back with a spring on the floating firing pin -- anyway I've had no problems.
Its more comfortable for me to "feel" a barrel with a hammer than a press. Since the chamber end is delicate the coin seperater might not work. I played with a couple of pieces of brass -- the gadget is in the shop, I'll get a picture.
Drive the barrel into the right place -- top and bottom count so rotational right place too. drill out the pin hole. bang the pin in.