Sorry for the vagueness, but generally speaking, flying in Norway is:
a. Not difficult in terms of controlled airspace, etc., just pay attention to weather and terrain. ATC is friendly and efficient.
b. The expensiveness of Norway is relative--there is quite a bit of myth along with fact. If you do not drink, it is not significantly more expensive than elsewhere in Northern or Western Europe, and the quality/price rapport is often better.
c. Fuel, landing fees, and aircraft hire (if applicable) are usually cheaper than Germany/UK. Caveat: I haven't flown there since 2007.