Here are a few more things I've been thinking about.
Going long-distance with relationships, friendships, family... it's not easy, and it might not get easier. I still struggle with texting my boyfriend too much and not texting my friends & family enough. Coming back is great, saying goodbye is painful.
Take your time when deciding on jobs. I rushed into a babysitting job on the outskirts of Paris. The family I work for are really nice, but it's a bit of a commute, and people are always looking for someone to look after their children somewhere near you. Don't worry too much about finding something as soon as you arrive. Also, have a think about whether there's something you could do - work, volunteering, internships - that's to do with what you want to do next, or what you're studying now.
Stay on top of your studies. Please. I am, once again, swearing that "next time I'll start revising earlier". Don't let that be you.
Stay in contact with people in the same country as you. Get a SIM card. Have credit. Have internet access, or know where to get it. Cities feel a lot bigger when you're lost and can't get in touch with friends.
Live with other people, at least to start with. Whether you want to go onto sharing or live by yourself, it will help you get to know more people and go out into the city.
Be a tourist. Don't take the city for granted! There are so many free events in the centre, and fab places to explore further out. Have you been to the 20th arrondissement yet?
