It’s been so long since I lived there a lot of my information is probably out-dated, but if you’re in a big city area, or even just outside it, it’s pretty surprising how easy it is to navigate with minimal or no Japanese language skills at all.
If you are looking for a phone, Softbank is a big retailer and the ones near the major train stations should have English speaking staff; phone are not cheap. As a visitor you can only pick up like a SIM card but someone with an address should be able, at some point, get one of their subscriptions. I was never there long enough for that piece.
If you plan on using your debit card early on before figuring out your banking situation, Post Offices have machines that can read the cards and pull cash from. Hopefully you have one without foreign transaction fees. Sometimes those lines are long as people pay bills there too. I think it’s still a cash society. I walked around with tons of cash. I didn’t advertise this, but after the first couple of times I didn’t feel unsafe. If you do get a “regular” phone I think you can buy a lot with it now too.
I have like zero direction sense, and minimal Japanese language skills, and navigating the trains and traveling around Tokyo was surprisingly easy. If you have some, you’re in even better shape. There is a lot of English there, maps and signage everywhere too. Just keep track of when trains stop running because they do… stop running. Taxis are ridiculously expensive. Oh yeah, Tokyo is huge… like, giant huge city, don’t plan on seeing it in one day or so. Assuming you are on a train route and no it, get yourself a train card like Suica (could be a different company depending on the route).
Hi-tech toilers are fun. Only dead souls forget to marvel at these fun contraptions. Enjoy!
If you have tattoos, try and hide them, especially going to hot springs. I hear it’s better now but still…
Soft rules:
No tipping. There’s no tipping in Japan. In fact, they often say it will embarrass everyone involved when you try. I was told early on not to tip so I never tried. I am sure you know about the shoe thing. The business card sensitives is real, take it with two hands read it and don’t put it away. Card and gift giving is a thing. If you are staying with someone, like right off the plane, bring something with you to give them, something local is usually fine. Be punctual, no seriously being late or even not being early is often a thing.
Japanese deodorant is awful. We must have industrial strength here. You might want to bring some extra until you adapt to what they have.
Bowing can be challenging. It’s easier to follow someone’s lead. Hey if our presidents can’t get it right, we get a pass too! Seriously though, just read up on it and do your best. Like Japanese language itself, the effort is usually appreciated and business situation, well I assume someone will inform you.
Seriously though, don’t worry. It’s a great country!
If you forgot something, didn’t bring it, you’ll probably be able to get it. They’re postal system is fine, though not cheap, so you can certainly ship things too. If you’re lost, a few people might wave their hand in front of their face (this basically means go away), but eventually you’ll get help. Try to learn the language. If you mess it up, don’t worry, they’re often thrilled when you even try. Warn your friends and family that at some point you’ll vent and tell them you hate it… and you don’t mean it. It’s just one of the stages.