Pioneer Speakers Wiring Clip Stuck

Hey, I'm a total newb at this car audio thing, but I was given a pair of Pioneer speakers (cheapies, but I'm not going to complain since they're far better than the factory crap I had) for christmas and was having a go at installing them. Trouble is, in a fit of newbie idiocu, I accidentally grabbed the wrong wire and connected the wiring attachment included in the packaging instead of the adaptor I bought for my Jeep. I managed to get the smaller metal 'clip' off, but I cannot get the larger of the two. It's stuck on there and doesn't want to come off. Anyone have any good tips for getting those off? I've searched around and, as far as I can see, I'm the only idiot not intelligent enough to figure this out. I don't want to damage anything by just continuing to yank or taking a pair of pliers to the thing. Any help is appreciated! -CE