shears will pinch. Use a tube cutter (normally used for copper pipe) and cut slowly, tightening the wheel slowly as you rotate around the tube. The other alternative is a hack saw followed by sanding to remove sharp edge.
mark Beer Diary...
I have heard many people to advise against cutting; instead, bend the tube up a little. I do neither, myself, even if I "secondary" in the keg. The first few pints are a slight bit cloudy and off-color, but it clears up quickly.
Don't cut it dude. Just wait a little bit longer for whatever yeast sediment you have to settle a little harder, then tap.
If you wait long enough whatever crud is in there will set up and you'll later find a divot in the crusties around the dip tube. I get two cloudy pints tops if I leave the keg to sit long enough.
Just keep building that pipline, it will be OK.
But if you must, rolling pipe cutters like plumbers use.