Kaiser's plan is not far off from what needs to be done; although there are variations in tactics depending on location. Here are a few different methods for getting rid of them, although they are generally used for post-invasion cleanup:
Netting: Set a net up across a river, and try and get it to go as deep as possible. Have two people guard the rope keeping the net from flowing away on both sides of the river, blow the brains out of any zombies that might accidentally cut the rope, and be wary of any that have the strength to get out of the river's current (zombies don't need air!). After a while, bring up the net and blow the brains out of any trapped zombies.
Baiting (mobile): For this you will need a shotgun, a vehicle such as a van or truck, and two people; one to drive, and one to hide in the back. Drive whatever you are using around a bit at a pace too fast for the zombies to catch you, yet slow enough to keep them within shooting distance, making as much noise as possible; honking the horn, blasting the radio at full volume, (preferably through external speakers (this is possibly the only real use for sub woofers)) etc. This should attract tons of zombies to you, but don't worry, that is just what you want. Once you have a large enough 'tail' of zombies, the person hiding in the back should now open up the rear and start blowing the brains out of the zombies, one by one. The zombies, with their one track mind, will not be deterred.
Baiting (stationary (does not come recommended unless you are willing to possibly risk an animal's life, although if done properly, this method should only end in zombie re-death)): Find an animal that makes a lot of noise, such as a dog, goat, song bird, etc. Put the animal in a cage, leave it out in the open, hide somewhere, and do something that would cause the animal to start making a lot of noise. A bird would work best since you could theoretically hang its cage from a tree, and reduce most of the risk on its life*. The noise the animal is making should attract zombies to your location, where you can dispose of them through decapitation (be wary of the heads though, they still bite) or head shots. If done correctly, you can eliminate the zombie before it harms your bait.
Congrats, you've just killed all the zombies in your area! But now you have several rotting corpses lying around your area, what will you do with them now?
Disposing of the bodies: First and foremost: do not allow any of their bodily fluids inside of you! Zombies can still infect you for weeks after re-death! If you have any open cuts either a; cover them with rubber gloves, tight fitting, long sleeve shirts, or boots, depending on where it is, and be careful. Or b; don't participate in the cleanup. Preferably b.
There are two know ways of safely disposing of zombie corpses, cremation and closed off burial. So those are your options; burn 'em carefully, or bury 'em carefully and close off the burial site. Either way, be careful, and if near a tundra, be ready for more in the spring.
