I have two Agfa/Ansco 8x10's. On each the bellows mounts the same way and it's a little more complicated than I've seen on other cameras. As mentioned, there is a front and a rear bellows frame. The bellows itself, however, attaches not to the face of the frame as with other cameras, but to the inside surface. Thin strips of wood which fit the inside of the bellows frame are tacked through the bellows and into the frame. The end result is that the bellows material is held captive between the wood strips and the bellows frame. The bellows is very secure in this way, but for the same reason, it's a bit difficult to remove the old bellows. You have to pry the wood strips up, being careful not to crack them (they're old, remember). And save those old tacks. New ones might not fit as well. When that's done, the old bellows has to be separated from the frame to which it was glued. Invariably some scraping will be required to get all the old bellows and adhesive out.
I've had one bellows replaced on an Agfa and have another one waiting to go. The first was done by Camera Bellows in England. I sent them the old bellows attached to the frame. They removed the old bellows and attached the new one properly and it was all included in the price I was quoted ($327 at the time). A little expensive, perhaps, but they did the job right and it was done very quickly. Whether you send yours to them or to Western, I'd leave the old bellows on the frames and send it to them to remove and replace. The frames themselves come out of the camera fairly easily. Go down to the hardware store and get a small blade (3/16" or so) screwdriver with a long shaft. Mine came from ACE Hardware and is about 18" long or so. It's my "bellows" screwdriver. It will make life much simpler when dealing with that front bellows frame.