One thing that I've not seen mentioned is that you don't have to feel like you're the one that has to answer all the questions, just because you're the lead. Deferring questions to those you feel may have more specific knowledge shows that you know where your weaker areas are and where the strengths of your team are.

This also goes for asking your team questions, don't be afraid to ask them things you feel unsure on rather than try and power through.