For a new Berlin resident, I translated at the immigration office (Ausländerbehörde) from German to English and English to German. I have also vetted translations from German to English, and Finnish to English.
When I learn languages, I translate from a given target language into English, and vice versa. Another technique that I use is to read bilingual material so that I can see how ideas have been translated. It can be quite enjoyable to see what flexibility of expression a translator has used to keep within the sentiment of a particular story line.