Mazda 323 1977 wheel bearings

1. Loosen driveaxle nut.
2. Jack up the car and remove the wheel.
3. Put a screwdriver through the caliper and in to the slots in the disc, this will stop everything from turning while you remove the hub nut.
4. Remove the caliper, the disc and the hub.
5. Using a two-jaw puller remove the bearing assembly.
6. Replace the dust seal and put the new bearing on the driveaxle.
7. Tighten until the hub and bearings are seated.
8. Put everything back together.

That is what I did with the Cavalier, I can't see it being much different.