You're better off going to a garage, you'll hit no end of problems if you do it at home, with the fronts, you'll need a press, then you'll have the problem of removing the inner race from the hub, with it being an old car, you'll have fun getting the races out, you'll then need to press the new ones in, as for the rear ones, with it being a gt, it'll have discs on the rear, which i've not yet worked on. So unless your good with spanners and persistent, take it to a garage lol:)