Just install it on any empty 88gr tank and refill it just like any paintball tank, just need to carefully weight them to prevent overfilling (they don't have a safety burst disk).
PD: this will also allow you to remove the tank from the gun without emptying the 88gr tank ... just unscrew about 1 to 1-1/2 turn, fire once or twice to empty the valve, then finish unscrewing the 88gr. Be sure the adapter does not unscrew from the tank, they do have a setscrew to secure them but better be safe than sorry, I marked mine so you can tell if the adapter becomes loose - it will become an unguided missile if they do come apart, not a funny scene.
you're scared ? go get a dog ... I'd rather die standing than live on my knees