Counting is easy. You can count up to 31 aces on one hand.

Card counting is not about just counting the aces. It's about keeping track of the ratio of high-value cards to low value cards in addition to keeping a side count of aces. All while you're trying to remember the basic play strategy for the particular ruleset you're playing. Extreme detail can be found at the Wizard of Odds, one of the best sites on gambling information I know of.

Oh, and to touch on something that was said in the other post... Counting only gets you a house advantage of a tiny percentage, so you can only profit from blackjack in the very long run. To make cardcounting worth your while (i.e., for something more than entertainment value), you need to be a ruthlessly good card counter, you need to play very high stakes games, and you need to have a huge bankroll.

And as was already said, if the camera guy catches you doing anything that looks like counting (i.e., using your fingers to keep track of aces), they can ask you to leave.

(I'm told that In every place but Atlantic City, all businesses have the legal right to refuse service to anyone for any reason. In Atlantic City, there is a law that says games of skill are illegal, and since kicking you out for cardcounting would be tantamount to admitting that blackjack is a game of skill, the AC casinos don't kick you out for cardcounting. I dunno how accurate this information is, but it was in a FAQ that I read a few years ago.)