I clip my dog's nails every 3 weeks or so, and have for quite some time. Her nails are black, so I am very cautious. I'd rather take a little off at a time then hurt her. I've never cut the quick, but she is also really good about grooming.
Last week I bought dog clippers for the first time, and clipped her myself. She is a labradoodle, but her hair is more lab than poodle. It took a little time to get used to it, but I was really pleased when I was done! Our last experience at a groomer (recommended by a friend) found my dog left in a cage from the time we dropped her off at 10:20 till they FINALLY finished her at 5:30. Inexcusable, and then they wanted $75! Never again. She is still as a statue for me, so it is not a challenge, and I will save a fortune.