Misskey instance?

Hi, new to the fediverse, mainly looking at Lemmy and mastodon right now through mbin, liking it very much.

I'm a Japanese language learner, currently at N3 and wanted to look at some fediverse content in that language. Keep hearing about misskey, but registration is limited from outside of Japan? I'm going over there next month, does that mean I could open an account while I'm there?

Also a bit confused about how it works, when browsing as a guest everything seems to scroll at lightning speed, how is one supposed to use it?