What's an anatatomist? I trust you have experience injecting? If not, I don't recommend pgf2a. It is harsh to say the least and the benefits do not outweight the sides IMO. I shot my chest by going a bit to the right of my nips. I can see veins around my nips so I did it in a mirror to try and avoid them. Don't forgot to aspirate though. I used a 1/2" pin for nips and IM injections mostly. Though I also uses a 5/16" pin for bi's, tri's, and delts. You have to judge what size pin is good for you based on your bf %. Oh, and don't fucking start with 0.5cc at a time. You will regret it. I started with 0.25cc in each tri and didn't feel much so moved up to 0.4cc later that day and felt it. I was up to 0.5cc by day two but increase the dose slowly. The most I shot was 0.75cc on each side and it hurt for like 2 solid hours. Fuck, DO NOT inject a muscle the few days after you work it. I shot my chest too soon after hitting it in the gym and it stung like a fucking bastard, and their is no escaping the pain until it subsides. I do recommend shooting say bi's in the morning then working them at night. Pumps are best that way. If the stuff isn't working for you, stop taking it.