You should take the rest of the hub off and clean them up either in a parts washer, or with WD40 and a cleaning brush. Pull off the plastic caps and leave them off, they just get stuffed with water/mud. Once the caps are off you'll see the other 6 bolts. When you put in new grease, don't pack them, just use thin coats on the sliding parts. My first one too me about an hour and a half, now I can do both in about 45 minutes. They're really easy after you do one.