The ethnic Japanese of Brazil that work in Japan as dekasegi (dekassegui) do not exactly have it easy; you probably wouldn't want the kind of jobs that they are hired for.
I have been working on a presentation tomorrow on this very subject. When I get home I'll share with you some of my source material. In the meantime, you can just do a search on sites like youtube for dekasegi or dekassegui. Understanding portuguese will give you a decided advantage in your research. If you are looking for white collar work your experience getting to Japan will obviously be different, but you probably won't have the easiest time finding work here.