I was going to write a blog post for you about how to replace a light switch. As I did my research in an attempt to present the information in a complete and concise manner, it occurred to me that all I was doing was trying to reinvent the wheel. So, rather than writing something which would simply qualify as another layer on top of a multitude of existing quality information, I present you the highlights from: "Gary's favorite electrical switch replacement tutorials:"
How to replace a light switch from About.com
Better Homes and Gardens, replace a switch.
Michigan State University explanation of how to replace a wall switch.
I invite you to review these three step-by-step tutorials. You will find that they each provide a good basic guide to getting the job done. I've also included a nice list of electrical safety tips from the Natural Handyman
that you can review and share with your friends and loved ones.
Always remember that when electricity is not treated with the appropriate respect, it can become an effective killer in the blink of an eye. When it comes to electrical repair, there can be no guess work involved.