I just began injecting testosterone cypionate IM as part of a TRT regimen and I have a couple of questions regarding proper aspiration. 1. Just how far back do you have to pull on the plunger to aspirate? 2. What is the likelihood that you could aspirate, see no blood, but slightly reposition the needle before injection and be in a vessel? Is there anything to minimize this? I am currently using a 25 ga x 1 inch, rotating quads.