I would advise every young English-speaker with even a vague desire to see the world to do this - during higher education if possible, or otherwise shortly after leaving formal education.

It won't ever get you hugely well-paid work, but it will give you access to some work with acceptable conditions pretty much anywhere in the world that doesn't have English as a first language, and in most cosmopolitan cities that do. Aside from the online opportunities that now exist.