What I tell people is not to worry about their specific tech knowledge -- that should be something that you have more naturally. The biggest issue I see is not

What I tell people is not to worry about their specific tech knowledge -- that should be something that you have more naturally. The biggest issue I see is not being able to be coherent in explaining a tech project or concept. I would practice succint answers to technical questions. In addition, if you are not comfortable coding in front of someone and explaining as you go, practice it with friends in mock interviews.