Hmm i agree! it seems really really complicated and theres a lot that could possibly go wrong in terms on visas etc.
I would say without a doubt I trust and know my partner inside out, granted we have only been together 10 months but we have known each other an additional 5 months and got to know each other very well before actually getting together.
I spent 2 months in australia last year (this is when i met him orignally) and we spent a lot of time getting to know each other during that time. Since then he has spent a month in the Uk with me, and I have also spent a month in Australia with him (both trips between our study gaps)
It seems really fast paced,but having spend so much time together I have full trust in this person without a doubt & yes we have both met each others families during mine and his 4 week trips and they are both supportive fully of us both and believe in us.