Earnings Calls are hard. They are like chess - where you have to think about 3-4 moves ahead every time. Whatever you tell investors in this call, you have to bear in mind that you will speak with them in 90 days - and they will remember what you said last time.
Metrics - you have to disclose metrics that you are prepared to share every time. Metrics that indicate the health of the business, yes, but also the ones that are truly strong.
Guidance - the guide you give has to be something that is achievable. Investors are conservative type - so missing the guidance spooks them. At the same time, you have to be cautious that you are not being so conservative that next time they will ask you to raise the guidance substantially.
Narrative - the narrative you build has to be more towards the direction you are heading in, and current results have to be presented in the context of that direction. Anomalies are not taken nicely.
Transparency - In the narrative, you have to be careful about the level of transparency. There are going to be times, wherein a weak quarter or a less than stellar quarter will lead investors to asking about metrics that aren't doing well. At such time, you have to be careful and not agree or indicate concern about any such metric - else that will be all they will want to discuss. You will have to deflect it to something else at the time. For eg. if new customer growth is slower, you'll have to suggest that our strategy is to acquire quality new customers, or expand into our existing base. Investors (sell side analysts) are the suspicious sort and they can blow this out of proportion.
Minimize Surprises - if you want to introduce a new concept, or are expecting a driver to impact your results in the future, it is critical to start sensitizing investors in advance. And this "advance" sensitizing can/should happen as early as possible (maybe even 2-3 quarters ahead of time). Because when this concept/driver does hit your results (or guidance), they are already aware of it and don't consider it to be a surprise element that they don't understand. CFOs should take the time to explain the drivers in earnings calls, call-backs, roadshows, etc.
Preparation - above all, earnings call require incredible preparation. About the numbers, about the narrative, and metrics that drive the business. The CFO's command over the business and investor sentiment (to anticipate the questions that might come up) are key tools to drive the preparedness.
Ready to take input - sell side analysts generally have sophisticated models that are informed by analytics. Finance teams typically factor in much of the analytics important to the business. But there are going to be occasions where investors conduct deeper analytics to inform their models - analytics that your finance team isn't doing. At such times, CFO (and finance teams) should be willing to pickup and start conducting such analytics. By the same vein, CFO should be willing to discard metrics that aren't relevant anymore.
All in all it's an art to manage earnings calls with retail investors.
Good companies that do a good job with earnings calls are very thoughtful of managing earnings calls. They evaluate every earnings call in the context of previous calls, metrics shared, questions on those calls, road show questions/comments, expectations (and commentary in those reports), subsequent calls after the current call, and future drivers.