I've been self injecting Estrogen valerate for several months. There was someone at the clinic who watched over me for 3 lessons before I was given a prescription for my own syringes. No responsible doctor is going to allow anyone to self inject who hasn't been properly trained.
I prefer the injections for several reasons. I liked the patches, but they would not stay flat on my skin, so I needed an alternative. I was taking the pills for about a month, the dosage was considered to be maximum for the pills. With the injections, I inject once every two weeks. It took a bit of time before the body really became accustomed to the timing, and now I can feel the estrogen level dropping off at about the 10 day mark, but not enough to be a problem. Once I inject, it takes a day or so before the estrogen level rises to a noticeable degree. By noticeable I mean that I feel a little bit "better." I've never experienced the mood swings that some people have reported. Either I feel "solid," or more stable emotionally, or when the estrogen level is low, I feel more like I felt before HRT. I do not experience highs or lows with HRT to the degree where it really affects my mood or behavior.
The dosage that I inject is the maximum. It really is high, my doctor is very much up to date on the current research and is extremely experienced and cautious. He doesn't take unnecessary risks; I trust him. Because of the high dosage, I have no interest in adding pills to the regimen. I'm not interested in adding anything else, my spiro is at the low average end, and everything seems to be moving along. I'm not expecting overnight results, breast growth is in spurts, my only problem is with weight gain. I will not say that injections are superior to pills. To make a statement like that from personal experience is impossible. I only know how different forms of estrogen administration affect me, no one else. I've had good results with patches and injections, insufficient time to evaluate the pills. It's all a question of the correct dosage as well as time, I would think. It's all a matter of personal preference, all methods work.