Q: Should the hub and bearing be pressed from the steering knuckle by a professional mechanic?
A: Because it needs an experienced mechanic to do it, the job needs special tools and skills to remove the hub from the Steering Knuckle. The assembly can however be dismantled removing the steering knuckle and hub which can then be taken to a motorcar machine shop or other repair facility which has proper tools. There is a process for taking out a steering knuckle and hub.
Q: How to replace the rear hub assembly on a Saturn LS and LS1?
A: Loosen the rear wheel lug nuts. Chock the front wheels to keep the vehicle from rolling, then raise the rear of the vehicle and support it securely on jackstands. Remove the rear wheels. Remove the brake shoe or disc brake assembly. If equipped, also remove the ABS wheel speed sensor. Remove the hub nuts and detach the hub from the knuckle. Check the hub bearing for wear or damage. Spin it with your fingers and check for rough, loose or noisy rotation. The bearing can't be replaced separately, so if the bearing is bad or any other problems are found, replace the hub as an assembly. Installation is the reverse of removal. Tighten the hub nuts to the specific torque. Install the wheel and lug nuts, lower the vehicle and tighten the lug nuts to the specific torque.