@leoboulton if you need tips, feel free to reach out.
I rexommend you look at how fast you can move around the country and then decide if you want to take a Japan rail pass or not. You can easily travel Up and down in Japan.
Because you can see a lot of Japan in 2 weeks.
Also Tokyo is Tokyo, it's very different from the rest of Japan.
I would aim for no more than 3-4days if it's your first time in Japan.
In any case, enjoy!