I think you have a pretty good handle on most of this...in order to retrieve an image from a specific location all you need to do is get the Lat/Long of the area you are interested in and input them into the proper page, http://internetsar.org/searches/boychuk/index.html , in InternetSAR.org (making sure to login first) and then d'load the KML file it will generate and open it in GE...

Pretty easy after the first time and you know what the screens will look like...

Welcome aboard...

Jim