Well the first thing you want to know is to get Swedish's bull outta the way. Their structure is remarkably similar to English even though they're not in that direct evolution of languages, but the real problem is their pronunciation of words; for example, the root "ske" is not actually pronounced "skay", but "quay". Just warning you for certain loops Swedish will throw around you while listening to conversations. And if your teacher is actually good, he/she will have you listen to recordings to see if you can pick up these odd root and suffixes.
Pro Tip #2: Y and I sounds are pronounced differently. I is more narrow, while with Y you have to open your throat up.
