Costs in Lucerne are not cheap, if you compare to American costs. It also depends on what your standard of living is. I'd say that if you are single, you need an income of at least 4,000 or 5,000 Francs per month to live comfortably and not want for anything.
Here is a website where you can get an idea of apartment costs. I've already tailored it for lucerne.
You can of course get better deals if you live out of town, but you'll have to commute. If you don't mind that, I'd recommend going to one of the neighboring towns, where the taxes are lower.
I was born in Lucerne, and I still have family there and visit 5 or 6 times per year. Drop me a line if you need any help. It's really one of the most beautiful places in the world to live.
The only thing you should feel when shooting a terrorist: Recoil.