While researching York Minster I came across an interesting, and indeed rather moving, account of the restoration of the south transept rose window by the glazier.
And he says two things in particular that are very interesting.
First of all, he's convinced that the window only survived the fire because it has already been restored, so it was in good shape - the pieces of glass weren't loose in the leading, so they didn't fall out.
Secondly, which I think is most interesting, he mentions that when the restoration of the glass was half complete, he exhibited it in the chapter house so that people could see it from close up. I've noticed that conservationists and craftsmen nowadays are often - not always - keen to show what they're doing.
The old practice was to swathe the object of restoration in layers of netting, and ban visitors - it's still being done in Italy, unfortunately, which seems to be one of the least progressive countries in Europe in this regard. (I would love to be proved wrong.) But if people can't see what is being done, how will they know that it's worthwhile?
Anyway, enough of my views; read the article for yourself.