According to the SOC, HRT can be prescribed without intent to fully transition. There are certain changes from HRT that are most likely permanent (probably the most important being eventual infertility). However, most of the changes are likely to be subtle: drier and less oily skin, less body hair, more subcutaneous fat, some breast development (sure, you might get C cups, but don't bet on it), etc. Most trans women starting their transition any time after their early 20's have to try and do more than simply go on HRT in order to ensure that people read their gender as undoubtedly female, or at lest very nearly so. At the very least, this includes removal of facial hair.
So going on HRT is actually just the thing to give you a "nice mixture of both" male and female ... much to mu chagrin.
By the way, DO NOT skip the estrogen. Just don't. Your body needs it -- either that or testosterone -- and just going on T blockers is likely to kill not only your sex drive, but your drive in general. Some doctors start with just T blockers, but they introduce E within a few months.
Now here's the one problem with your whole plan:
Once you begin to transition, you will very likely decide or realize that you want to fully transition, to "go all the way."
There are two reasons for this. The first reason is simple: Society doesn't do a very good job of making a place for people who don't fit well into one of the two binary gender categories or the other. The second reason is more complicated: Transsexual people, by the fact of being transsexual, don't have an experience of living in a congruent gender role until they transition, which makes it difficult to imagine what it might feel like to do so. As a result, many go through a period of identifying as neither female nor male, which quickly ends after a few concrete steps toward transition. My personal experience and what I have read on this site over the last three years suggests that HRT is often the catalyst that makes people want to TRANSITION RIGHT NOW!!!! It really threw me for a loop, even though I had been warned.
In other words:
Don't get married if you are planning to start HRT soon.
Wait at least a couple years and see how you feel.
Best wishes for your journey. It will probably be difficult, but also extremely rewarding, wherever it takes you.
