*If these are two Hobby players, I would say it is def best to first TALK / Request this before making any attempts to play it out.*
So anyway. This is mostly opinion, and a little experience
If we are talking about the roles of Dom and Sub in the bedroom only, then I think one person can be taught (or as you put it take someone so far out of their head / messing with your head) to behave as either and enjoy either.
A certain type of person may not enjoy one as much as the other, or may feel an extreme sense to either of loathing or adoration. Just like there are true Sadists and Masochists in the world for who knows what reason. Or just like a certain position or fetish might be on your hell no list or a fave.
The participant, say me for instance, has to be willing to give it a shot and appreciate the opportunity. Feeling safe is probably the most important tool that would be necessary to begin playing with these roles (def for me anyway).
If a person is timid, don't consider that a red flag. Different people have different barriers, and reasons. If they don't get too annoyed keep trying. The best way to get a lover to learn new things is if they can understand that this serves a need for you. That it turns you on. Here is the answer, and how to do it, you're going to ace this test. That you like it, and want to share this wonderful adventure with them. Begging like a baby has also been known work (I don't suggest this).
I encourage Masturbation (for any reason really) as a perfect stepping stone, and guiding the masturbation of a potential Master or Servant that you're hoping to mold. Start slow if need be, and you both can enjoy a new experience and journey.
For a person who is regularly controlling, or consistently responsible, letting go for your Master must be a relief. As the submissive partner, you may feel reduced to a simple slave. And how nice it can feel. Do as you're told (just like you've secretly wanted to do all along). Should you not do that because your ego fears it? No! Do it! Will it be scary, frightening, humiliating, shameful, dangerous, exciting, thrilling, dirty, and so many other things that you have been missing out on?
For someone to step into the role of the Master after always doing what they're told day to day, year after year, can be exhilarating. To dominate another by pleasing them, and satisfying a need that they have to be controlled on this occasion. Knowing your power to punish and torture them until they climax at your command and mercy gives the both of you amazing pleasure. It's like touching Heaven.
As far as taking it out of the bedroom, that's just weird. I mean a joke or two here and there is ok, but living that way doesn't sound healthy. Like if someone lived like they were a Vampire or a crew member on Star Trek every day 24/7. I advise against this even though I consider people who do this very interesting.
Anyway, if there is one thing I say about Psychology, or Sex, or really any concept, idea, or thought, it is to have an open mind and curious nature. You'll be surprised at what you can learn, especially about yourself. Btw overthinking is ok, you're not alone