Unlike in Fallout 3, New Vegas allows you to aim down the sights, which means that you can realistically fight without the use of VATS, even in tough situations.
Now, even Fallout 3 fans will want to pay attention to this tutorial, because shooting in New Vegas is done a little differently. Here, she's going to teach you how to shoot a gun. When you locate Sunny outside, she can be seen wielding a rifle with her dog standing guard nearby.