Easy isn't a word I'd associate with cover removal Dave, and definitely not on re-install. The underside of the cover has clips which are not so bad, but the fabric tends to have wires across which embed into the foam and attach with circular sharp ended clips which are clamped together to complete the circle. They are b**chin to get back on. I'd let an upholsterer do it as it can look gash if you don't get the tension back in the covers.
