Definitely the best info on the www with regards to getting the nut covers off the new 21s. I just pulled all of mine off, and like Corsair says, you learn the technique quickly, and once the first one comes off, the others come off "easier". A few things I'd also add so there isn't a run on the parts dept. to buy replacements for all of the broken ones that are sure to come:
1) use leather gardening
gloves or suffer numerous finger pinches
2)
wiggle back and forth towards you AND towards the car. The more wiggle and less pull only, the quicker they'll come off (sometimes flying somewhere). This can be a two-handed job, with one hand pulling and keeping the clip free and the other one (maybe just a thumb) pushing in. A side-to-side wiggle is essentially impossible.
3) if you're getting worked,
and you will get worked, I'd suggesting using copious amounts of ultra
sudsy soap in a squirt bottle (for lubrication) and getting as much on the backside of the cover as possible. Then continue the wiggle with gloves.
4) I wouldn't recommend using a screwdriver
5) It probably will also help to check out what the cover looks like on the backside and what the wheel looks like without covers
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