I agree with all the advice so far about socializing your cat to grooming... I've found with my cats that the best approach has been to start slow, let your cat inspect the brush or comb as often as they like, try to groom them when they are already comfortable on your lap or next to you, try to groom them in the room where they feel most comfortable and stop grooming when they've had enough.
5 out of 6 of my cats have medium to long fur and here's a picture of the tools I use for grooming my babies... I particularly like the combs as they guarantee that I'm getting through their thick undercoats but the cats particularly like blue glove pictured and I find this is a good tool for helping cats distribute the oil through their fur and for collecting fur they are shedding.
The glove on the left is the best thing I have ever bought for my cats. I call it the love glove... It's a great combination of brushing a cat and petting a cat. I find it gets TONS of fur off all of my cats when they are in shedding season! I spray it with a light spritz of water before I use it too just to keep the static shocks down to a minimum.
The comb furthest to the left I don't use all that often but does do a good job for cats with thick undercoats (like Audrey).
The comb in the middle is the one I saw over and over again at the Cat Show I attended a few years back. I can't recommend it enough! Not only does it do a great job at getting their undercoat, but also, it doesn't irritate the cats skin at all and my cats don't mind me using this on them one bit. It has a wider and narrower end so you can start with one side then move to the other... It's great! Makes me wish I hadn't bought some of the other grooming tools I have!
The comb to the far right does the best job of lifting and separating their undercoat, therefore when I use this comb I am positive their coats are knot free and ready to go. But my cat's generally would prefer me not to use it as the ends are pointy and I think it scratches their skin. I only use this when I haven't combed them in a couple of days and the middle comb isn't available... (ie it's in a different room of the house.