Essential re-upholstering tips to save your old sofa

Is your furniture shot in wing and limb, its colour and patterning so dated you collapse onto its frayed arms and sob? Still, it has been a noble, comfy, solid servant, suffering thousands of physical and liquid assaults. Can you really let it go?.
A coffee spill, a light rip, that hideous fade where the backside slides on the seat — that gorgeous line that prised a four-figure sum out of the wallet obliterated by perfectly honest wear — is it right to ditch?