Clipping Your Dog's Nails

How often should you clip your dog's nails? Should you do it yourself or take him to a groomer? I prefer having someone else do it because I have been able to find some groomers out there that will do it for only $5., which doesn't break the bank for me, besides, I am afraid that I am going to cut too low and I certainly don't want that. Maybe it's also because I don't want my chihuahuas to think of me as "the bad guy" if I do mess up. However, even when I do take them to cut it done, I will still sometimes use a small nail smoother, one of those little tools that you can buy, battery operated to smooth the cut nails a bit so they aren't so jagged and tough. However, if you do prefer to do it yourself, I have found a really good article that may help you with it. http://www.professorshouse.com/pets/dogs/how-to-cut-my-dogs-nails.aspx
It seems easy enough, and if you are brave enough, go for it.