Baraka's 5 Step Program To Better Fingering:
1. Cut your nails as short as possible- right down to the skin if you can, but not to the point of any actual pain or discomfort. My recommendation is to use a pair of expensive cuticle nippers- the high torque kind that manicurists use. They're, like, $15-20 and usually come with a lifetime guarantee. Trust me, it's an awesome investment. Who said that nothing good ever came out of the whole metrosexual movement?

2. Cut off any tough skin that exists at both corners of each nail. Although none of this skin will have any nerve endings, the skin underneath does, so you want to do this with extreme caution (sort of like the last part).
3. File down each and every nail with a quality nail file- even your thumbnails.
4. Test out each nail on a towel that you've used a hundred times. Rub them sideways, and rub them up and down the material. If you feel any resistance whatsoever- let alone have a nail actually catch on the towel material- then you need to do more filing. Rinse and repeat. Once all the resistance is gone and your nails glide smoothly along the material, you're there. The entire process of cutting and filing your nails should take about a half-hour. If it doesn't, you ain't spent enough time on it.
5. When approaching your fingering, don't do what a 16 year old getting his first pussy would do: dive right in there without a ton of warmup first. Get her real, real wet with a good session of kissing and touching... then going down on her using your tongue only. When she's visibly wet- dripping wet, preferrably-
then start using a finger. A minute or two later, add another. And maybe another a bit later.
That's basically it. You don't need to do any finger acrobatics, like spinning and all that shit. Just apply some good pulsing pressure. And don't stick to just the G-Spot, either. Further on in is the AFE (anterior fornix erotic) zone, which will really drive her nuts if it's stimulated properly. It's about an inch or so past the G-Spot on the same part of the vaginal wall. It's a different texture, so you'll know you're there when you feel the change in texture. Search for "AFE", or "anterior fornix" on these boards and you'll see more that I and others have posted on this magical spot.
Happy fingering, troops! rofl