Here is a very good site with pictures and detailed directions on trimming a dog's nails.
From the website of
Washington State University
College of Veterinary Medicine
Click on the link below to read the full article.http://www.vetmed.wsu.edu/ClientED/dog_nails.asp
this article shows which side of the clippers face you -- which side face the dog
and even what the inside of the nail looks like so you know when to stop cutting
The article talks about the two most common type of nail clippers, how to hold them, and when to use which style. It shows the angle a correctly cut nail should be and how to position the dog for a trim. Many very good pictures and helpful hints.
Photographs by Henry MooreI highly recommend this article to anyone who cuts their own dog's nails.