I've never been off HRT but the times I even had accidental drops in estrogen or rises in testosterone I felt so bad that I would never consider going off hormones. Once diagnosed, the hormones gave me my first really good night's sleep since childhood.
That said, if you want to avoid extensive therapy, you can get hormones through informed consent, at least in California, where I live. But be prepared to pay cash, because health insurance does not pay for treatment for something without a medical diagnosis. And if you are going to treat cross gender adventures as a hobby, be advised it is one expensive hobby. I can honestly say that trying to establish a golf handicap was cheaper. Building a "fast and furious" tuner car was cheaper.
And if you really are male, hormones are going to make you feel terrible, impair sexual function, and may leave you sterile.
If you go off hormones, you will most likely keep whatever breast development you have, but once you are back on your own testosterone, you will lose the soft skin and whatever fat redistribution occurs while on hormones.
I started to see breast development after only three weeks, but the softening of skin and body fat redistribution only really started after more than a year on hormones. And my body is really only just starting to hourglass after almost two years of HRT.
If preserving male sexual function is your only concern, there is a private pay endocrinologist in Marina Del Rey, California who supposedly can do that, by cycling hormones. He supposedly works for all the trans girls in the local porn industry. But he does not take insurance or public benefits. He takes cash only and he is very expensive.
You should really see a therapist first before you experiment with hormones and figure out where you really are, because the consequences of taking hormones are so far reaching.
If you aren't already, I would suggest going the full Monty with cross dressing, using pads, foundation garments, etc. to see how it feels and if this is really what you want. I wore silicone pads in my bra for several weeks before deciding I want breast augmentation.
If you decide after a lengthy dry run that this is for you, then maybe see a gender therapist.
Oh, and discussing dosages and methods of administering HRT are forbidden by Forum rules. Please see a professional for that.