I’d mostly agree with this, but I’m not sure the stress element is necessary. I learned a second language while living overseas. Most of the people in my office spoke good English, and I’d just speak their language as much as I could, filling in my gaps with English. I’d ask when I didn’t understand something, or when I wanted help forming a sentence. There was a fair bit of code-switching to begin with, but I had a good conversational grasp after a year.