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Actually, it's not that hard. You need a stud finder, and the right equipment comes with the mount. You can find the right one.

You never hang a tv in the drywall; you hang it from the studs (vertical wooden 2x4 lumber) that the drywall is attached to.

You can find the studs by tapping; where the wall sounds least hollow, that's a stud. They are most often 16" appart, so if you find one, try tapping for the next 16" away. If you think you find one closer, then one of the ones you've found is likely a false alarm.

Or you can use the stud finders, replacing your finger-taps by more advanced ways to test for hardness.

Once you think you've found the studs you'll use, drill a small hole about an inch deep. Stick a nail into it, to make sure there's wood on the other side.

Some really old houses don't have drywall, but instead have plaster on lathe. (and may have drywall ontop of /that/). Lathes are horisontally running wooden strips -- unfortunately not really strong enough to hang a TV on, tho. Plaster and lathe walls have studs too, but you'll have a harder time finding them, as the plaster and lathe a) will pass the drill and hammer test, if you don't go deep enough, and b) are harder, so the difference between hollow and not hollow is harder to tell, both for you and the stud-finder.

^^^ Good advice.

I just hung mine over the weekend and it went very smoothly. Remember: ALWAYS PRE-DRILL YOUR HOLES!

Johan posted great advice. I use a small wire nail to double check the stud finder. I tap in, hit wood, then tap in to either side to find the edges. You end up with a bunch of tiny holes, but they're covered up by the bracket and tv anyway. It's worth it to know for sure.

Soon, flatscreen TVs will be thin and light enough to hang on the wall like a painting. But until then, I recommend most people attach the TV to optional mounts that suspend off of some media credenzas (BDI, Omnimount, etc) or to a wall unit like the Loop and Kyoto from Crate and Barrel.

The problem arises when the place you want to hang your flat screen is not where your beams are. Then it opens a huge can of worms and money to insert braces into the wall to hang your tv from. No one wants to have their flat screens land on the floor. I suggest this is not a DIY project in most cases.