How do I load/use a custom map?

[dandavis]

Could you elaborate a little bit on the "open the map file in the text editor and load it" bit?

When I did this before, I succeeded in getting a "A map with 59 provinces" to show up in the available map list, but never with a specific name or any other information.

Another question:

I've also reduced the number of available starting provinces to 1 on a map before -- but it has still located me anywhere. In your experience (anyone kind enough to reply) have you been able to guarantee yourself a starting location on a given map using the map editor?