Using a screwdriver or a utility knife to remove fabric can be dangerous and cause injury. It may also ruin any exposed wood you have on your couch.
This is true! I guess I wasn't very clear - I've really only recovered chairs before, but every time I have had to remove screws to dis-assemble it, so obviously, a screw driver will be very handy for that. Also, sometimes, upolstery fabric will have a latex coating over the back of the fabric. In the past I have found it hard to cut through with scissors, so I have used a utility knife to carfully cut out my fabric.