I use my dremel & it's very easy. As stated above, just make sure to keep it even on both sides for balance.

The other thing you might want to consider before you dismiss carellh's suggestion of a spinner nut is that during training we tend to eat up alot more props than an experienced rc pilot. With that in mind it is alot quicker & easier to change out a prop with a spinner nut on it than an actual spinner. The spinner nut still carries the same nice appearance as a spinner too. Just something to think about.
Good luck.