I absolutely hate having to cut my dogs' nails. I would usually have my dad do it while I held the dogs (3 mini dachshunds), but even then it was difficult for me to watch my dad sometimes get the quick. We'd use the traditional dog nail clippers, but I did buy a grinder. I tried it on the dogs, even with the recommended "hold down" procedure, but I just gave up after a while because it felt like some sort of torture.
The thing is, my dogs nails grow really fast and crazy sharp. Even though they are outside dogs and their running around should help file them down, I always find myself trying to avoid their claws as their jumping at my legs. Other than my dad cutting their nails though, we never took them to the groomers. Sometimes though, our vet would take the liberty and cut their nails. That was always a relief.