Hammer curls are a very basic weight lifting exercise that anyone, from beginners to professional chunkheads, can do. Do remember, of course, that it's important to vary the weight according to what you can handle. If you're a beginner, try 5-10 pound weights until you can handle something heavier.
Check out this video to learn how to do hammer curls with the right form. These hammer curls will tone your biceps and triceps.