I wouldn't even bother with any of these DNA testing businesses like Ancestry DNA or whatever. And especially because my ancestry is Japanese. Truth be told, there are MANY rich and varied streams that go into Japanese DNA, but I have heard these ancestry kits have next to nothing for those of East Asian descent. It's all for European and African-blooded people (and maybe Native Americans), which may show all kinds of variation in their results, while East Asia is just lumped together as 'East Asia'. That means nothing, as Asians have as many rich DNA variations as Europeans.
I've also heard that these tests are not even all that accurate, and people have gotten different results from different DNA tests. The fact is, NOBODY is "pure-blooded" anything. I've started thinking that everyone has 2 sets of grandparents, 4 sets of great-grandparents, and etc., etc. Keep going back further and further and multiply, and everybody has a staggering number of relatives, even if only distantly. They didn't all stay in the same places, but naturally branched out and away.
My family is very much 'Jomon' Japanese in appearance, especially my dad's side. When most Westerners imagine Japanese people, they think of Japanese with more 'Yayoi' characteristics.
In the end, I'm really my own person, and I don't define who I am by my ancestry, although other people have tried to define me by that.
Jim