If you want, tell me your exact Arminius model (marking on frame/barrel) and I will produce a model-specific step-by-step manual of arms (loading/unloading sequence, exact controls, troubleshooting, and maintenance checklist).
Because the Arminius lacks a grip safety and many lack a transfer bar, your holster is your primary safety. Arminius Revolver Manual Of Arms
Never dry fire an Arminius revolver. The firing pin is cast into the hammer (or is a small steel pin). Without snap caps, the pin strikes the edge of the chamber, peening the soft cylinder throat and breaking the pin. If you want, tell me your exact Arminius