Most of the questions have been answered well enough - with the exception of the answers about language; the basics of Finnish are actually pretty easy to learn.
Before arriving in Finland (and I'd suggest ASAP) get on play.com / amazon.co.uk and order yourself a couple of beginner audio CDs - I got hold of the Berlitz and Hodder & Stoughton offerings (though 12 years ago they were casettes!). I listened to them in the car in England on the way to and from work, for a month before arriving here (about 30 hours of listening - meaning I went through each one about 10 - 15 times).
That was enough to teach me the basics, numbers, tell the time, days of the week, nouns, how to order in a restaurant, which I could do from day 1.
It's progressing beyong the basics that's challenging, that's where the 30 hours of professional tuition will come in handy.
If you did German GCSE / O-level that will make life a lot easier - all signs and packaging are in both Finnish and Swedish. If you don't know the Finnish but can decipher the Swedish, it helps you learn the Finnish word.
And amongst the natives, fluency isn't necessary, nor is it expected. What they like to see is that you are willing / trying to learn. That goes down far better than "I'm only here for 2 years, it's not worth the effort".
