This is gonna be a long one lol
Before you do that, just go to their expat communities online to see what you're dealing with. I never understood why people want to move country to begin with except maybe to retire in a place with a warmer climate. Even if you don't like them, it is your homeland and your people, and forgetting even that you would be leaving all your friends and family behind for a culture that you could very easily feel very alone and ostracized.
I am not interested in what people that are not me (expats) have to say about living there. They are not me, I am not them, and I have no idea what mentality they had/have when living in a different culture. Yes, I would be an outsider and of course I will never be one of them, but to me, that's okay. As long as I can absorb their culture and get as close as I can manage, I will be happy.
I do not like my homeland (USA for anyone not following). I do not like the citizens here, I do not like the infrastructure, and I am tired of dealing with it all. These are not my people, and I do not have friends or family here that are so far emotionally from me that I can't talk or visit them anymore after the move. I already live across the country from my Father (for the last 10 years but I still try to visit him once a year) who is my only family member. My only friend, is someone I've known for at least 14 years (that I met on the internet) and he wants me to chase this dream. He is also willing to keep a spare room for me in the house that he plans on building on some property he just bought, in the event that things don't work out or if I just want to visit for a week or two. We would have no issues going back to communicating online since that is how we met.
I am already very alone and ostracized so it would hardly be different in that regard. In the absolute worst case scenario, I end up living in the same situation I'm currently in which isn't the worst thing ever because of the bonus of being able to explore a new land/culture. During my extended time here, I enjoyed how compact my 6 tatami room was, I enjoyed the communal bathrooms, I enjoyed the public baths, how close everything was in the city, how clean/fresh everything was in the rural areas, the scenery, the history, the people. I am 99% certain that I will feel like my life has improved once I move there.
Finally, in addition to all of the above, I live only to work and to relax when I'm not working. The perfect match for their work ethic, since I never have anything urgent to do after work anyway. Their work ethic is not a concern to me. I'm aware of a lot of the conditions that people report that they work in and that is a potential sacrifice I'm willing to make. I really believe moving there will only be an improvement to my life, but as I said before, I've got nothing to lose.