In reply to cookieman:
I've taken a couple of PYB courses. It's usual for the course organiser to talk with everyone on the first morning to get details of their experience so far, and to find out what they would like to achieve from the course. The course, whilst running to a rough outline schedule, is then tailored to suit the requirements of those taking it.
You certainly don't need to be able to climb high grades indoors to benefit from any of the PYB beginner/intermediate level climbing courses.