I'm based in the UK and have gone about buying 2 swords that were located in Japan, my written Japanese is virtually non-existent and my spoken Japanese is very basic. One, a wakizashi where the dealer spoke little to no English I got Pablo Kuntz to help me, he instructed his contact in Japan and for a small fee the sale, paperwork, etc. were finalised. The transaction went very smoothly.
The other was via a Japanese dealer who understood English pretty well. So, I undertook the importation myself and it was pretty straightforward. I was fortunate not to fall foul of customs when the package arrived in the UK.
One UK dealer I can recommend who I've had good dealings with is Ian Chapman (also a member of the To-ken Society), he once found me my first ever piece, which I still have - a koto katana.
I have no business interests with anyone named above, this is simply my experience. Hope it helps.