Try: 200 Epcot Center Dr, Orlando, FL 32821 Depending on the map is in your GPS it should get you very close. It will at least get you to the Disney World Welcome sign on Epcot Center Dr. Continue on Epcot Center Dr. until you see the sign for Epcot.
It actually isn't a difficult drive. From the Airport head for the South Exit and then go west on 417. Have a couple of dollars of change for the tolls. Get off 417 at exit 6, Rt 536, World Center Dr. Go straight and this road turns into Epcot Center Dr. as you cross over I-4. Epcot Center Dr. curls around Epcot. The exit for Epcot Parking will be on the right.
Your GPS might take you out the North Exit of the airport to 528 to I-4. This will work, it actually might be a few tenths of a mile shorter, but I find the 528/I-4 route a bit more hectic with higher traffic, especially on I-4.
Wishing you a magical visit!