I assume that you have found a book, special tools, or some instruction on how to replace the sacs? When I did some investigation it did not sound too hard. More a, take your time sort of thing. I think Pendemonium, or someone else I get emails from sells a kit from time to time with a book, shellac, those long-shanked forceps, and other tools of the trade.
"Never turn your back on a Breen".