Even if you want to have low levels of moderator involvement, it’s important to have a robust discussion guide in place. Being organised and having effective questions in place ensures the discussion will be high quality.
It’s a good idea to start with broad, open questions and then ask more specific questions to hone in on the details. Try and make sure the way you phrase your questions won’t steer the participants toward any particular opinion, too.
Most importantly, frame your discussion guide around the goals of your research to make sure you’re effectively collecting the data you need.