I a bit confused by the original poster's first post that said he "never picked up tools to work on anything", and post #19 where he "build a Westfield and a AC Cobra", but never the less....

Building a simple kit, like a Four Star 40, or putting together a basic ARF does not take a tremendous amount of inherent skill. If you go with a good manufacturer, like Sig or Great Planes, you will get an excellent instruction manual with detailed photos of every step. in addition, any of these popular models have been built and documented here on RC Universe dozens of times. I would consider RCU to be the best teacher you are likely to find.

I had never built an RC plane before buying a Four Star 40 kit, and I was able to build it by myself in a few weeks and it flew great. My advice is to just pick a popular trainer model (LT-40, PT-40, Goldberg Falcon, H9 Alpha, etc...) and just go for it. Most are available as kits or ARFs, and you will find tons of information here at RCU for any of them.

One thing to keep in mind if you are building planes and then relocating to another country, completed planes are diffficult to ship, so if you build a plane in Japan, you will likely want to sell it or give it away before you leave. That's another reason to keep the first build to a simple trainer.

Good luck. I think you will find it much easier than you think, and any question you have will be answered by fellow RCUer's within minutes.