Hi Jeff,
Have you tried using the railing library parts? Most have a curved option under 'general dimensions' in the library part parameters.
If it is something more ornate, perhaps use a complex profile wall for the handrail, and individually place the posts and balusters using tall thin columns if circular/square, or if it is a turned style of baluster use another complex profile wall that is rotated around a central point.
Hope that helps.