Lennart (a Swedish friend of mine) and myself found out that, every time our English vocabulary failed us, we just said the German / Swedish word, and found they were usually quite similar to the word in the other language. (About 19 out of 20 times over the course of a week.)
Then again, you might find that the scandinavian grammar totally eludes you, and that you have a natural talent for Spanish. You never know.

The thing is that, Swedisch, Norwegian, and Danish are reputedly so closely related that it suffices to talk slowly and pointedly. (Much more so than with German / Dutch, which is already pretty close.)