I have one broken window pane in an oldish wooden French door that
leads outside.

The pane is about 6" x 12" and is held in by wood slats on inside and
outside (no glazing).

Apparently I need to take the door apart somewhat to get a new pane in.
How do I do this?

I found an old thread on this question that said French doors have a
removable molding stop on one side, but I can't find it.

I'm moving next week so I need to get this fixed, and glass places in
town want $150 to come do it.

Thanks.