Karen is in Nipomo, so if driving is a problem, I would go with her. I know she has a good rep with already going horses, not sure of her experience with greenies or starting them. Lou Moore Jacobsen is in Paso Robles (about 2 hours north of Nipomo. She starts a huge majority of the young horses from Santa Ynez to Fresno. A great asset in our area. To me it would be worth the drive.
Do not toy with the dragon, for you are crunchy and good with ketchup!
You could try Skelton Performance Horses in Santa Maria. They start QTR, Warmbloods, Arabians, etc.. for various disciplines ranging from Dressage to Reining. They also have miles of trails to give horses a break from arena work.