I also had bad acne growing up, and I have to be honest it was one the biggest fears of my transition and something I was determined to fix. Here are my thoughts and observations:
1). The hormones are going to take a long time, I'm talking years before you see the full effect onth pores of your skin. But they do work, just don't go holding your breath waiting for a miracle. They do make pimple problems go away though, especially once I was on a full dose and heading for surgery.
2). You cannot do anything about the quality of your skin until electrolysis is done. All told my electrolysis spanned almost 3 years. I was pretty much almost near my srs date by the time I was able to fully address my complexion.
3). While that was going on, I made sure that I kept the dead skin off of my face. I was recommended to use Amlactin lotion for my skin and cleaning with cetaphil and also use exfoliators regularly. It took a good 6-9 months before I started to see the benefit of a skin and teeth care regimen that would put a born woman to shame

4). Once everything I was done, I went for facials and there is nothing like the treatment. It cleans and opens up the pores nicely. A good facial will get all of the gunk out of your pores, and then they close up and your skin will take on the texture of a genetic female.
5). I made an appointment with a dermatologist and decided to do dermabrasion. He recommended 6 treatments spread out over 6 months (one a month) and I had to use special creams on my face. The dermabrasion did work for me and in fact I would recommend it to anyone. The treatments ran me about $100 each and the creams were another $100. I was done with electrolysis, so I had money to blow on things like this. I also had my teeth whitened. The face to me is a package deal

6). Nowadays I really enjoy taking care of myself. In fact half of the fun to me is keeping myself beautiful (or as beautiful as I can). Before my transition I hated my body, after my transition I take really good care of my investment and enjoy having a pretty smile and smooth skin to match the rest of the surgery and hormonal effects.
So I just want to say, you can do it. It just requires a lot of effort. It's not even expensive, just a lot of time and a boat load of patience.