Thanks to Cherry
Having done the poof, the previous armchair, the Edwardian chairs and been inspired by Cherry (another Jumbletowner), I decided to tackle my couch and an armchair: here are the results.
My advice is to take photos along the way, keep the pieces as a template for when you are cutting your new upholstery, and to write down the sequence you took them off as you will be working the other way putting them back.
Some old couches are much better quality than anything available on the market today so it can be worth looking past that old fashioned material and seeing the shape and structure of the couch beneath. :-)