If your afraid of electricity then I'd suggest that you leave it to someone else, on the other hand if you are fairly competent and willing to double check your work then it's not a big deal.
You bring 14/2 cable from a power source to a light switch, the blacks will connect to the switch (one at the top and the other at the bottom) the whites will continue on to the light fixture.
Connect the ground to the switch with a pigtail and connect the ground to the light fixture at that end.
Make sure your connections to the power source are correct as well, black to black, white to white and grounds connected as well.
Here is a web page that explains the process in detail and gives a diagram
http://www.selfhelpandmore.com/switc...htswitchsw.htm
Hope this helps.