I would recommend you have a professional show you how to do it the first couple of times. They'll show you the right brushes, combs, clippers, and scissors to use.
Here are some links to videos on grooming Yorkies and poodles:
http://www.youtube.com/results?sear ... g+yorkshire+terrier&search_type=
http://www.youtube.com/results?sear ... ery=grooming+poodle&search_type=
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