I've been in many, many IOPs over the course of my life. Some experiences were good, some not so great. I have found that the most important things to ensure having a good experience are having good rapport with the facilitator, being open/willing to learn about the material, and being open/willing to give and receive feedback. It may be intimidating at first, especially because it's something you've never tried before, but within a couple of sessions you'll get the hang of it and things will be easier from then on out.

Good luck. If you have any questions or concerns don't hesitate to PM me. Take care!