Norway is all about the quiet of the deep fjords and the click-clack of the Flåm Railway climbing past waterfalls. You want to aim for the shoulder season in May or September when the crowds thin out and you can actually hear the rivers. Booking flights and rail passes six months early is the only way to keep the costs from getting out of hand.
A typical trip runs around $4200 once you factor in flights, trains, and decent places to sleep. Spreading that number out over time takes the sting out of the initial booking wave, and using the right card helps you do that without paying interest.
That 0% window is a hard deadline, not free money. If you still have a balance left when those 18 months are up, the standard interest rate kicks in on what is left over.