Follow the I-4 signs out of Epcot except do not take the Magic Kingdom signed ramp. When you see the first overhead green sign for I-4, take that and then bear left for I-4 east (northeast).
Get off I-4 onto 528 (Beach line) east.
Get off 528 at its exit 9 (Tradeport) (You're about 2 miles from airport)
Left and cross under.
(Nice cheap gas station right here to top off at.)
Get into middle lane (still) facing north.
Required right onto McCoy.
Just over a mile later is 436 (Semoran); turn right to enter airport.
Total tolls one dollar.