First I put all the photos I want to geo-tag into a separate folder. Then I use Panorado Flyer which is a simple and FREE software that allows you to choose a location in Google Earth, then right click on your image file and Panorado will install menus in your pop-up, one of which says "Get location from Google Earth".



Click on that and it's instantly assigned.

For more info, download and a walk-through, check it out at:

http://www.panorado.com/en/PanoradoFlyer.htm

CC