Arched window glass replacement in front door

-_-

Like most of my house projects, I was fixing one thing and broke another...
Anyway, we have a front door (circa 1935) with an arched window. It separated into 4 panes by moulding. How do I remove the moulding to replace the glass? Did they usually cut small individual panes, or is it one big half-circle of glass?

Windows on Wash

Picture of the inside and outside (up close) will give us what we need to know in order to make recommendations.

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Sorry I didn't get any pictures.
I scored the seam of the moulding with a razor and then pried it up with a putty knife. Used a second knife to push it away from the glass. It was held on with small brads.
They don't sell plate glass for doors anymore, I had to use safety glass. Turns out that is a little thicker, so I used a Dremel tool to trim the moulding.
Anyway, I'm all set now.
Found a decent video about a similar problem:
http://www.youtube.com/watch?v=u6FHjnmDjKQ

Gissle

The will almost definitely be single panes.

A photo would be useful, but did you fix it already?

It's going to be difficult to cut safety glass, don't you need it to be pre-cut?