Window felt- how to replace?

Ok, Ive used the search function... cant find how to replace these.. Ive found where to get them, how much they cost, who makes the best ones. but no postings on actually how to replace them. I need to put new gaskets as well, but those are straightforward.
Anyone have a set of pictures showing how to remove and replace the felts?
66 A body Cuda btw if that matters