"Godfrey Muganda" wrote in message

1. Is it possible to just replace the glass?

Yes.


2. Is it better to replace the frame that holds the glass panes?

No.

3. Should I replace the entire door? This is what my wife would like.

Sometimes. Depends on the condition of the door. There are some new ones
with much nicer features than a 30 year old one. While not needed, it may
not cost all that much more to u pgrade.



Are any of these something a newbie could do on their own, to save on
labor?
What would be the relative costs?

Yes, depending on your skill level. Replacing the entire door is a four to
eight hour job and two people are needed. Trim must be removed, the old
casing removed, the new one set in place, plumb and square, trim replaced.
I'd guess that $300 to $500 for labor.