If you cut a lot of boddies a pair of lexan scissors is worth the $7 investment, but for one time only kitchen shears or any other heavy duty scissors will work fine. But keep in mind using them too much will dull the scissors pretty quick. A shorter rounded set of scissors will let you cut the rounded areas out really nice and clean. If you have problems with your masking, you can get a paint on masks that work really well. You just paint them on the entire thing and then cut aroudn the areas you want to unmask and then peal them out. I never have problems with paint running under my paint on masking.

I use these [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXD573&P=ML]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXD573&P=ML[/link]
I picked them up at my LHS for $6.50. They are short and rounded so they work well for everything except for the body mount holes, I just use a drill with a really big carbide burr on it.