Just wondering where in Sweden you're from. I lived both in Sweden (Goteborg) and in Poland (Szczecin) for a short while, as well as In Germany (Hannover and Berlin) for somewhat longer.
English will probably get you around Poland much like Swedish would around Germany LOL
Best to learn most of the lingo on site, I'd say-:) A crash course beforehand though wouldn't hurt either.
Best of luck!
Merely a side point, but many older Poles, i.e. 50+, understand quite good German depending on the level of education. Same too with the Swedes, I found when I was living there. Often, I simply gave up trying English and used basic German. At least at the time, it worked quite nicely-:)
Poles look forward to Swedish and other business from the more prosperous countries of Northern Europe! Sadly, it's not the reverseLOL