I have been using nail clippers, not the most effective but it works for now. There is a gardening tool that could work as well but I can't think of the name of it right now (not much help, I know).
As with Moonstar, I'd be interested to know about your wood wicks as well because I've been having trouble with them.
I've been using the ones from the flaming candle. If I use a blended wax or a soy with additives the flame gets wild after only being lit about 30 minutes, even after sizing down on the wick and keeping it trimmed. Then I used GW 415 and had success burning it for a couple hours at a time, nice flame size and crackle. However today, the flame keeps snuffing itself out (only burned a total of 7 or 8 hours before doing this). Trying the C3 again with various wick sizes. If it doesn't work, I feel I might have to give up on them which is disappointing because I love the look of wood wicks.