Re: Training in other dojo's as a beginner
I've done this, though so far not across a language barrier. It's a lot of fun.
The basics of throwing and falling are very recognizable across every dojo I've visited (four different styles) and you can learn a lot as a visitor. Weapons classes are more iffy because there is more divergence among styles, and learning the first eight moves of a kata your school doesn't do is not as useful as working on the unarmed techniques.
It actually get a bit scarier as you advance, at least for a while (I'm fourth kyu now, hoping to be third soon) because if you look like you know what you are doing, people will treat you accordingly. I come from a style which de-emphasizes breakfalls and have had a few surprises while visiting, but so far no injuries. If you know there's a gap in your repetoire it may be a good idea to tell the teacher so.