For what car, a 69 Nova? Are you looking to do stock replacement seat covers or custom? Stock replacement seat covers are made by PUI and you can get them from places like The Paddock, Classic Industries, Year One. But you need some quality hog ring pliers and some decent hog ring cutters. I did my 70 Camaro myself but it gets painfull after a while. If you do all the seats with hand tools you might not be able to hold a beer for a week!
If you don't want to do them yourself, give Paul a shout.