I just switch to injections for my estrogen this week and had my first session on how to self-inject at the same. Even though my doctor commented on how well HRT is working for me we both agreed that switching to injections will help speed things up. Also after 7 months on HRT (pills) my testosterone was still on the high side ( Total Testosterone: 187 ng/dL, Free Testosterone: 4.8 ng/dL) and she didn't want to up the Spiro any more. (She also increased my Finasteride.)
As far as the injections go, the nurse showed me the first time. The second time the nurse with do the syringe and watch me self-inject, then the 3rd time they will watch me do it all. Once they are confident I can do it on my own, then I will do it on my own every 2 weeks. With a 21 gauge needle, there was hardly any pain whatsoever (barely felt anything). It goes pretty deep in the thigh muscle, and the stuff is pretty thick. So we'll see how it goes. It could be in my head, but I swear a had a little breast growth on the 2nd day after my injection. (My wife thought so too and that made her happy as well.)