>>6328I am an English teacher. I have a uniquely good position though - I work just 12 hours a week. Most people don't have as good hours or conditions as me though, and even so, I'm working hard to get into translation and editing so I can top up my salary.
What you've got to think is: what can you do that the Japanese can't do? And then get as good at doing that as possible.
I work in Korea, so competition here is generally less fierce because of how much less desirable it is. In Japan, you will find it much harder to find ANY kind of good position, regardless of the field.
My advice is either get qualified enough to get a GREAT teaching job (you'll need a DELTA/MA in Education/JPLT1/more than one of the above to get one of these though) OR do something else.
Always too remember that your job/conditions will likely determine how much you'll enjoy your life. Personally, I would advise you if you really just want to get away from it all and live in Asia is to start in Mainland China. You can get a cushy albeit not so great paying uni job straight off the bat with a CELTA if you're willing to work in a less than great location and you can have a pretty good lifestyle.
Honestly while Japan is a nice place to visit, for most people Japanese or foreign it's a terrible place to work unless you're really fucking special (amazing quals/specialization).