[MBZ] 124 rear axle CV joint repair advice?

[Werner Fehlauer]

I'm getting occasional "crunch" noises from what appears to be the left rear 
axle CV joints, and would like to learn more about what is involved in 
repairing/replacing worn parts.  For example, how much work is involved in 
disassembly; what special tools are required; any special techniques that 
would suggest that an experienced M-B mechanic should be used?  And if one 
side needs repair, is the recommended approach to do both sides?
I assume that Rusty would have all the requisite parts, but knowing what to 
order so as to put the car up on a lift only once would be a big help.
The car is a 1990 300D 2.5, with 226k miles.
TIA,
Werner
1990 300D 2.5 226k
1983 300SD 222k