FrankTalk.org

I have always injected trimix at either the 3 oclock of 9 oclock position is this the proper location for best results?

They're certainly good reliable starting areas. With your experience you should be able to expand the range a bit. I'll use 2 to 4 and 8 to 10.

Just be sure not to puncture your urethra. The lower on the clock face you go, the greater the chance.