My son and I traveled to Japan in 2012. I didn't know any Japanese and he could only read a few words here and there, after studying on his own for 2 years. On top of that, you can't really get a translation book because there really aren't any. They would have to be in Japanese. Our phone didn't work there because of the difference in technology. I could find an occasional WiFi hotspot (very rare at that time) and download a map of the area. We took a Garmin GPS but the battery didn't last very long (still NiCad batteries). There was no Google lens but the restaurants had windows in the front with plastic food of what they served. Remember the number and give it to the waiter.
We managed to get lost only a few times, not having enough money in a restaurant to pay our bill, getting on the wrong train and not knowing that they close the airports and train stations at about 11 PM. You have to leave, you just can't sit on a bench until morning. We had to find a place to stay. We found a police station where the officer in charge admonished us: "So! You come to Japan but you don't speak the language!". (He was trying to be funny.) But he was nice enough to point the way to a hotel where the desk clerk didn't speak English but called a someone who did and we were able to get a room for the night.
At a local restaurant we didn't have enough cash and they didn't take credit cards. Next to us there were 2 couples with one of the women speaking English. We had a nice visit with them and at the end the 4 of them took up a collection and paid the balance of our bill.
The next morning we were on the train back to Nagoya where you could always find someone who spoke English and there were signs in multiple languages to help you. We were there for 2 weeks, traveling by bullet train to many of the major cities and some of the small ones. We got off a regular train in the mountains and the station security person said to us..." No one here speaks English; no one". She was definitely right, except for the one girl with her friends who were in that town for the holiday; lucky us.
The moral of my story is this. You won't be comfortable if you don't speak the language where you are going. You may not even find someone in that area who does speak it. But there are good people where you will be, people willing to help you. Enjoy the adventure.
You will also gain some understanding for people visiting your country who don't speak your language. Be kind, try to find someone to help them if you cannot. Buy them a meal.