The fronts are easy. As above.
The rears, not so.
You have leaking axle seals. You will need a slide hammer puller to remove the axles. Rental shop. After that, you will need the puller with a hook to pull out the axle seals. You must be very careful in replacing the seals as they can get warped and bent on the way in. You will be back in again if they are not driven in properly. There is a driver tool to do this. And, if the vehicle is original, it would be a good idea to replace the axle bearings. And check the lube level in the differential as you have a leak.
If I am wrong the guys will correct me.
If you are not familiar with the rear-end problem I would advise you to go to a shop if it a once-in-a-lifetime repair.

Semper Fi