I had a groomer at pet smart do it. I was having a lot of trouble. I thought maybe if I watched her do it I would have a better understanding. She did it with her fingers and did a good job. My dog did not yelp that much.
Oh No!

At first we were takeing Oden to one of those Petsmart/petco groomers. There is a post here about it, I think that is even how I came to this site. They CUT him! I can't speak about all of them, but I just don't think those groomers are up for more than just simple work.
So this is what we did. We hunted down a local Poodle breeder, and asked who she used. This is how I found out that must breeders groom their own dogs. But she did not do the big poodles any more, and she had a woman who helped her. They asked to meet Oden and to see what had been done to him. The end of the story is we now have a standing 6 week appointment with the other groomer Joanne. She has been working on Poodle forever, and is wonderful with Oden, and returns him in one piece. And to boot! She doesn't even charge what Petco wanted. I was sure it'd be more and was more than happy to pay.
Guess the moral of the story is get referrals, ask if they have groomed poodles (we've had groomer tell us they don't do poodles), and get a feel for them. This is your fur kid you are leaveing with a complete stranger, make sure you feel safe, and if you don't like something leave. If you're not going back there anyway, what do you care what they think.