I think the directions say to inject at 45 days, I have waited a little longer, not much. That is to make it not be such a large discharge. My choice is in the neck, which is where most all are given today, just draw back on the syringe after you stick ir in, to make sure you're not in a vein, if blood registers in the syringe you may be in a vein, so retract a little and put an angle to it, kind of change directions then the same thing, if no blood comes in the syringe push. It's almost foolproof, don't worry n it will work. Good luck.
tryinhard