There will be plenty of English speakers, especially in hotels, conference places, public transportation hubs and very often in shops and such. Everyone in Sweden speaks English, even when I speak Swedish to people my accent gives me away and they respond in English. I didn't have any problems in Belgium or Germany either.

Some places might take debits cards without a chip but I know all European cards have the chip. Do you have a credit card? American Express and Visa are widely accepted in Europe. But should you have to use cash you can find places that do currency exchanges at all train stations and airports and usually multiple places in city centers.