You may be pleasantly surprised.
We moved to our French holiday home to live UFN when our son was 5. Six years later I have taken him for a two week visit to UK family. He was surprised and remarked of his own accord how courteous and helpful everybody was. He was surprised that everybody puts up their hand if they are waved through or people pull over on narrow lanes (compared with playing chicken in France).
On the language front, I am a teleworker in France so I stay in all day without going to meet people at work. Our business language is English, initially due to the many different nationalities but now due to having a German parent company so my French is already going downhill and has been since I moved to France.
Time is precious so holding a phone with Google Translate running is my usual way forward - it can also be used holding a phone over a ppt etc being shown on video call when you don’t have the doc to translate!!