You have to ask why it so important to retouch them. Most of the time it is about keeping a memory alive of people know and family that is old and gone. There are some things that can not be forgotten even though they are worth to do.
I myself have worked on these sorts of things. I have done a few things as they got water damaged with tea. So I have recorded myself sorting out all the problems with a document and the photos themselves. I will be adding the video to hear as it can be easier to see what I have done.
I hope this is something you would like to see more. I can do a step by step processes but as a retoucher I sometimes watch other people working faster, as it is relaxing and chilled out.