rear axle bearings

Howdy! Got my first LC and finally got all my parts, in the process of replacing the rear rotors and brake pads, I noticed a lot of oil on the inside of the Driver Side, Rear Rotor. Further investigation revealed a gap between what I assume is the Bearing Case(?) and the oil slinger at the end...

I've spent the last few hours reading and researching how to replace the rear axle bearings on my GX. Local dealer quoted $2100. Trusted local mechanic quoted $1500 which seems a little high. I'm mechanically inclined, I have access to a friend's shop with a hydraulic lift, tools, press, etc...