It's pretty straightforward. Remove the brake drum and unbolt the brake backing plate from the knuckle and remove. Unbolt and remove the tie rod end from the knuckle. Next, unbolt the ball joints and remove the knuckle. To remove the top ball joint stud from the top of the knuckle, hit the side of the knuckle where the ball joint stud goes down through it with a hammer. You will need to hit it hard and quick and it should pop out. Remove the bottom the same way, except you will need to hit the a-arm where the ball joint stud goes through. You can buy a tool for this, but I've never needed one. If you
do buy the tool, don't get the fork type tool, it will tear the rubber boots.
When you get the knuckle off, remove the seals and remove the snap ring that holds the bearing in. Now just knock the bearing out and replace with a new one. You will need a bearing driver or big socket or whatever you can find that is the same diameter as the outer race, so you can use it to knock the bearings out. When driving the new bearings in, make sure you don't hit the inner race, you will damage the bearing. Make sure you drive it straight. Don't forget to put your snap ring back in and new seals.
The two yellow arrows in the picture below will show you where to hit the knuckle and a-arm to remove the ball joints. Sometimes, it's easier if you use a pry bar to put a little upward pressure on the top a-arm when hitting the knuckle to remove the top ball joint from the knuckle. Also, it helps if you can get a pry bar in between the bottom a-arm and knuckle when removing the bottom ball joint from the a-arm.