Is getting around Narita Airport easy?

Changing flight there is a bit of a problem. They recheck you twice before boarding. But not a big problem. So have a hour or more between flights.

It's a little disorienting a first, but it's not terribly different than any other airport. There are plenty of English signs and attendants who speak English, so you won't have to worry about language issues

Narita Airport is not difficult if you keep your eyes and ears open. Lots of sign to tell you where to go. If you are concerned, you should look at the facilities and map of the airport before your departure.

https://www.narita-airport.jp/en

You also don't give any attention to getting to/from the airport - that is often a bigger concern - you can take the Narita Express train, Keisei, limousine bus or Access Narita 1000 yen bus. The last option is the cheapest, but you don't say where in Tokyo or elsewhere you want to end up.

https://www.japan-guide.com/e/e2027.html

BTW you'd be incredibly foolish showing up just 30 minutes before your flight - for domestic flights it would be seriously pushing it. For international flights you run the big risk of having the flight closed on you before you can check in and get to your gate. Things are efficient, but if everyone showed up 30 minutes before take off, the planes would all be very late - give yourself time to get to where you need to, with ample time to spare.

Is getting around Narita Airport easy?

If you can decipher JFK then Narita is much easier.

do most people there speak English? English is well understood. No idea if the minute you are there most will speak English.

The signs are in English and Japanese. Many many do speak English.

https://www.narita-airport.jp/en/step

Try to have your last sleeping night near the Airport. No need to be rushing a long distance aiming to be last on board. There is a large shopping area to keep you occupied while waiting for your flight home.

Suggest after you arrive and pass your Customs inspection before heading off on your adventure take a few minutes and explore the departure level. to ease your concerns.

Airports are the same all over the world. The signs are all in English. The gates are marked by numbers. It will be exactly like the airports in New York, except a lot more efficient.

Yes, English is the language of air travel. Just think how hard it is for people who don't speak English!

It's an entirely different experience than a US airport. All of the people working the ticketing counters stand outside of their positions waiting for customers. When I went through there, I was told to be at the airport "at least 30 minutes" before my flight. I'm used to getting to the airport 2 hours early in the US. Security took less than 2 minutes. It's exceptionally well organized and efficient. And there are plenty of people who speak multiple language there to help you.