Any how to's on rear axle seal and bearings replacement?

[msg]

I have a 66 that Im rebuilding and thought to have this rear axle sandblasted and then replace all the needed stuff that sand might find its way into. Ive been told to replace the seals and bearings but have never done work like that before. I called a garage and asked what they would charge for replacing all needed parts after a blast and was told at least $300.

Is it best to pay for that or is it something that can be done if someones got a how to on it?

Its a 12 bolt with E176 stamped lower right. From the other side (looking at the axle from the transmission) it reads 3856525 at the top right and on the tube what I think is a date stamp reads HA 06 02 W

Years back when I replaced the gear oil and gasket these numbers were stamped on the ring gear

3817778 11 41 GM 5 66 2

I recall that 11 and 41 were the numbers to use from that to ID the gear ratio.
41 div by 11 giving me 3.727 (3.73)