1997 Chevrolet Cavalier Wet Passenger Floor

Recently, I noticed that the passenger floor of my 97 Chevy Cavalier, both the front and the back, are very wet. Some online research suggests that this is because my condensate drain is clogged. How can I locate and unclog the condensate drain on my car, specifically? Is this something I can do myself or should I take it to a mechanic? Thanks for your assistance.