Get a serious briefing on the syringes and needle gauge. My compounding pharmacy gives syringes with 27ga needles, and 30ga separate, but with no expanation in the kit. The uro used the 27ga, but I'm told the 30ga hurts less.
The pharmacy, when I called, said use the mounted 27ga to fill the syringe, then swap it for the 30ga. Supposedly just punching the seal of the vial dulls the point. But no one explained how to go about that, and let's just say I managed to break a plastic syringe and lose a bit of trimix in the process. My nursing skills are limited.