From @helenvholmes to you 💖
If you're nervous about traveling in a country where you can't read anything: restaurants often have menus with pictures. The train system is all doubled in English. When you get in and you're exhausted from a huge flight, I recommend Airport Limousine Bus. As soon as you get out of customs, you will see a big orange counter for the company. Just tell them the hotel, and they will drop you off right at the entrance.
Most places take credit cards, but you’ll need cash for the trains. There are normally ATMs inside the 7/11s. It's worth it to get a Suica card.
Sim cards?: You can get one at the BIC Camera Shibuya.