Trust your reader. Not everything needs to be explained. If you really know something, and breathe life into it, they'll know it too.
"Ten rules for writing fiction" by Elmore Leonard, Diana Athill, Margaret Atwood, Roddy Doyle, Helen Dunmore, Geoff Dyer, Anne Enright, Richard Ford, Jonathan Franzen, Esther Freud, Neil Gaiman, David Hare, PD James, AL Kennedy, www.theguardian.com. February 19, 2010.