You didn't say where you would be coming from, or which show you're attending. If at MK take the boat. From Epcot, we like to take the monorail to MK and take the boat. If you're at DHS the bus to FW/WL stops first at WL, then at Pioneer Hall, where the show is. From AK, you're on your own. If at your resort, take a bus to DHS and hop on the FW bus. It will be the path of least resistance.
The show lasts right at 2 hours. Getting home is easy peasy. They'll let you know there.