It's best that you have a press to remove and reinstall the bearings, once the knuckle/hub assembly has been removed from the car. It can be done without a press (I've done it), but a press is highly recommended. Other than that, the main obstacle is having to deal with removal and reinstallation of the knuckle/hub assembly from the struts and ball joints. You'll need a 32 mm socket to remove the nut from the end of the driveaxle, and a long ratchet to enable you to apply a lot of torque (I think around 200-250 lbs) when you re-install the nut on the axle.

95 Contour Zetec, ATX (wrecked, sitting in the barn) 95 Mystique Zetec, MTX 2000 Taurus SEL 3.0L Duratec 1994 Crown Victoria LX 4.6 V8 1993 Chevy Silverado 4.3 V6