Are you going to actually take her to a groomer or do it yourself? Either way, they seem to get used to it easier when they are younger (and more "open" to new experiences). If she's not used to being groomed, you can help by spending some time before the first appointment combing, messing with the ears, the nose, the face, the paws (even if you're not really doing anything), because that's usually the hardest parts of haircuts and where nicks can occur from jumping and pulling away.
If you're going to groom her yourself, I'm NO help to you!!